bug#52823: 3 gx*lv2 packages fail to build in the same manner

[Thorsten Wilms]

Hi!

gx-saturator-lv2-0-3m, gx-slow-gear-lv2-0-3, gx-vbass-preamp-lv2-0-2
all fail in the same way, with many repetitons of `error: template 
with C linkage` and warnings for deprecated ‘GTypeDebugFlags’ and
‘GTimeVal’.Using gx-saturator as example:

```
In file included from gui/paintbox.cpp:20:
gui/paintbox.h:24:1: note: ‘extern "C"’ linkage started here
   24 | extern "C" {
      | ^~~~~~~~~~
In file included from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/glib-typeof.h:39,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/gatomic.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/gthread.h:32,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/gasyncqueue.h:32,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib.h:32,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gobject/gbinding.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib-object.h:22,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gioenums.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/giotypes.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gio.h:26,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdkapplaunchcontext.h:30,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdk.h:32,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtk.h:32,
                 from gui/paintbox.h:27,
                 from gui/paintbox.cpp:20:
/gnu/store/vakvgvrb839igv16jkif4lmx11d25jqb-gcc-10.3.0/include/c++/type_traits:2930:3:
 error: template with C linkage
 2930 |   template<typename _Fn, typename... _Args>
      |   ^~~~~~~~
In file included from gui/paintbox.cpp:20:
gui/paintbox.h:24:1: note: ‘extern "C"’ linkage started here
   24 | extern "C" {
      | ^~~~~~~~~~
In file included from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkobject.h:37,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkwidget.h:36,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkcontainer.h:35,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkbin.h:35,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkwindow.h:36,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkdialog.h:35,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkaboutdialog.h:32,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtk.h:33,
                 from gui/paintbox.h:27,
                 from gui/paintbox.cpp:20:
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtktypeutils.h:236:64:
 warning: ‘GTypeDebugFlags’ is deprecated [-Wdeprecated-declarations]
  236 | void            gtk_type_init   (GTypeDebugFlags    debug_flags);
      |                                                                ^
In file included from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gobject/gobject.h:24,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gobject/gbinding.h:29,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib-object.h:22,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gioenums.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/giotypes.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gio.h:26,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdkapplaunchcontext.h:30,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdk.h:32,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtk.h:32,
                 from gui/paintbox.h:27,
                 from gui/paintbox.cpp:20:
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gobject/gtype.h:704:3:
 note: declared here
  704 | } GTypeDebugFlags GLIB_DEPRECATED_TYPE_IN_2_36;
      |   ^~~~~~~~~~~~~~~
In file included from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtktoolitem.h:31,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtktoolbutton.h:30,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtkmenutoolbutton.h:30,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtk.h:126,
                 from gui/paintbox.h:27,
                 from gui/paintbox.cpp:20:
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtktooltips.h:73:12:
 warning: ‘GTimeVal’ is deprecated: Use 'GDateTime' instead 
[-Wdeprecated-declarations]
   73 |   GTimeVal last_popdown;
      |            ^~~~~~~~~~~~
In file included from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/galloca.h:32,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib.h:30,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gobject/gbinding.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib-object.h:22,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gioenums.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/giotypes.h:28,
                 from 
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/gio/gio.h:26,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdkapplaunchcontext.h:30,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gdk/gdk.h:32,
                 from 
/gnu/store/2sw8v141r6hjsv0mq7cwxxp6m2499y4v-gtk+-2.24.33/include/gtk-2.0/gtk/gtk.h:32,
                 from gui/paintbox.h:27,
                 from gui/paintbox.cpp:20:
/gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0/include/glib-2.0/glib/gtypes.h:545:26:
 note: declared here
  545 | typedef struct _GTimeVal GTimeVal 
GLIB_DEPRECATED_TYPE_IN_2_62_FOR(GDateTime);
      |                          ^~~~~~~~
make: *** [Makefile:98: gx_saturate] Error 1
error: in phase 'build': uncaught exception:
%exception #<&invoke-error program: "make" arguments: ("-j" "8" 
"DESTDIR=/gnu/store/ykys0igh8wgf4psdnpmw0y7zf5jqzadq-gx-saturator-lv2-0-3.605330f43")
 exit-status: 2 term-signal: #f stop-signal: #f> 
phase `build' failed after 2.5 seconds
command "make" "-j" "8" 
"DESTDIR=/gnu/store/ykys0igh8wgf4psdnpmw0y7zf5jqzadq-gx-saturator-lv2-0-3.605330f43"
 failed with status 2
builder for 
`/gnu/store/j51q8fqyhd949w2biyp5pwx6cl0f90zi-gx-saturator-lv2-0-3.605330f43.drv'
 failed with exit code 1
build of 
/gnu/store/j51q8fqyhd949w2biyp5pwx6cl0f90zi-gx-saturator-lv2-0-3.605330f43.drv 
failed
View build log at 
'/var/log/guix/drvs/j5/1q8fqyhd949w2biyp5pwx6cl0f90zi-gx-saturator-lv2-0-3.605330f43.drv.bz2'.
guix build: error: build of 
`/gnu/store/j51q8fqyhd949w2biyp5pwx6cl0f90zi-gx-saturator-lv2-0-3.605330f43.drv'
 failed
```

-- 
Thorsten Wilms <t_w_@freenet.de>