574. Make RENDER optional for Xvfb. When RENDER is enabled add depth 32

pixmap format to list of supported pixmaps (Egbert Eich).
573. Fix va_args glitches for xterm/libfontconfig: 0 == (void*)0 isn't true
    for all platforms (Egbert Eich).
572. Fix lbxproxy to also build on platforms that don't have snprintf()
    (Egbert Eich).
571. Fix va_args glitches in mkfontscale: arg stack isn't preserved after
    calling va_arg on all platforms (Egbert Eich).
570. Fixed x11perf aa benchmarks to support non-default visuals/colormaps
    (Egbert Eich).

fontconfig/fcprivate.h

@@ -87,7 +87,7 @@ _FcPatternVapBuild_bail1:					    \
     if (!orig)							    \
 	FcPatternDestroy (__p__);				    \
 _FcPatternVapBuild_bail0:					    \
-    result = 0;							    \
+    result = (void*)0;						    \
 								    \
 _FcPatternVapBuild_return:					    \
     ;								    \