modechange: need stdbool

[Bruno Haible]

lib/modechange.h include <stdbool.h>. So it should depend on the 'stdbool'
module. Currently it yields on error on HP-UX 11:

        cc -Ae -O -DHAVE_CONFIG_H -I. -I..      -g -c modechange.c
cc: "modechange.h", line 28: error 1000: Unexpected symbol: "_Bool".
cc: "modechange.h", line 29: error 1761: __non_sequential keyword not supported 
on HP-PA systems.
cc: "modechange.c", line 311: error 1000: Unexpected symbol: "_Bool".
cc: "modechange.c", line 312: error 1761: __non_sequential keyword not 
supported on HP-PA systems.
*** Error exit code 1

I'm applying this:

2007-03-11  Bruno Haible  <address@hidden>

        * modules/modechange (Depends-on): Add stdbool.

*** modules/modechange  27 Oct 2006 20:46:43 -0000      1.10
--- modules/modechange  11 Mar 2007 23:27:34 -0000
***************
*** 9,14 ****
--- 9,15 ----
  
  Depends-on:
  stat-macros
+ stdbool
  sys_stat
  xalloc