bug#35711: emacs crashes on m68k after d2f1971dd5

[John Paul Adrian Glaubitz]

Hello!

The commit [1] "Port flexible array members to GCC + valgrind" (d2f1971dd5)
broke emacs on m68k. This is because the new code aligns blocks of 1-byte
strings to 16 bit on m68k which is the default alignment on m68k.

The crash on m68k looks like this [2]:

/bin/mkdir -p ../etc
/usr/bin/make -C ../lisp update-subdirs
make[4]: Entering directory '/<<BUILDDIR>>/emacs-26.1+1/debian/build-gtk/lisp'
make[4]: Leaving directory '/<<BUILDDIR>>/emacs-26.1+1/debian/build-gtk/lisp'
./temacs --batch  --load loadup bootstrap
Loading loadup.el (source)...
Using load-path (/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/emacs-lisp 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/progmodes 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/language 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/international 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/textmodes 
/<<BUILDDIR>>/emacs-26.1+1/debian/build-src/lisp/vc)
Loading emacs-lisp/byte-run (source)...
Loading emacs-lisp/backquote (source)...
Loading subr (source)...
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
make[3]: *** [Makefile:738: bootstrap-emacs] Segmentation fault

The attached patch by Michael Karcher fixes the problem.

Thanks,
Adrian

> [1] 
> http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=d2f1971dd570439da4198fa76603b53b072060f8
> [2] 
> https://buildd.debian.org/status/fetch.php?pkg=emacs&arch=m68k&ver=1%3A26.1%2B1-3.2&stamp=1549253883&raw=0

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

fix-m68k-crash.patch
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