bug#12464: 24.2.50; nt/configure.bat fails to detect giflib-5.0.0

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 18 Sep 2012 18:13:45 +0900
> From: Kazuhiro Ito <kzhr@d1.dion.ne.jp>
> 
> Because gif_lib.h of giflib-5.0.0 assumes size_t is defined (I don't
> know whether that is intended), nt/configure.bat fails to check its
> availability.
> 
> In nt/config.log
> > In file included from junk.c:1:0:
> > f:/build/emacs-w32/include/gif_lib.h:262:37: error: expected ';', ',' or ')' before 'GifExtensionLength'
> > f:/build/emacs-w32/include/gif_lib.h:265:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'EGifGCBToExtension'
> > The failed program was: 
> > #include "gif_lib.h" 
> > main (){} 
> > gcc -If:/build/emacs-w32/include -If:/build/emacs-w32/include/libxml2 -g  -c junk.c -o junk.obj 
> > gcc -If:/build/emacs-w32/include -If:/build/emacs-w32/include/libxml2 -g  -c junk.c -o junk.obj 
> 
> Though I don't know whether Emacs supports giflib-5.0.0, the below
> patch can fix the problem.  Gif support on my binaries (built by gcc
> 4.5.2, MinGW) has no problem with giflib-5.0.0 as far as I tested.
> 
> === modified file 'nt/configure.bat'
> --- nt/configure.bat	2012-09-08 11:20:32 +0000
> +++ nt/configure.bat	2012-09-18 03:14:43 +0000
> @@ -627,7 +627,8 @@
>  if (%gifsupport%) == (N) goto gifDone
>  
>  echo Checking for libgif...
> -echo #include "gif_lib.h" >junk.c
> +echo #include "stdio.h" >junk.c
> +echo #include "gif_lib.h" >>junk.c
>  echo main (){} >>junk.c
>  rem   -o option is ignored with cl, but allows result to be consistent.
>  echo %COMPILER% %usercflags% %mingwflag% -c junk.c -o junk.obj >>config.log

Does it work to use stddef.h instead of stdio.h?  stddef.h is where
size_t is normally defined.