bug#7848: 23.2.91; Can't build with MinGW

[Eli Zaretskii]

> Date: Sat, 15 Jan 2011 16:34:08 +0900
> From: Kazuhiro Ito <kzhr@d1.dion.ne.jp>
> Cc: 
> 
> When I build emacs-23 branch at present with MinGW, below error
> occurs while linking.
> 
> > oo-spd/i386/temacs1.a(image.o):image.c:(.text+0xa8fa): undefined reference 
> > to `SET_SYMBOL_VAL'
> > collect2: ld returned 1 exit status
> > make[1]: *** [oo-spd/i386/temacs.exe] Error 1
> > make[1]: Leaving directory `/f/build/emacs-23/src'
> > make: *** [all-other-dirs-gmake] Error 2
> 
> SET_SYMBOL_VAL is defined in src/lisp.h on trunk but not on emacs-23
> branch.

Sorry.  Please try replacing this:

  SET_SYMBOL_VAL (XSYMBOL (Qlibpng_version), make_number (PNG_LIBPNG_VER));

with this:

  XSYMBOL (Qlibpng_version)->value = make_number (PNG_LIBPNG_VER);

and make a similar change in this line:

  SET_SYMBOL_VAL (XSYMBOL (Qlibpng_version), make_number (-1));

I cannot test this where I'm typing this mail, but if you tell me that
these two changes fix the problem, I will commit this change to the
release branch.