Stop overwriting CFLAGS in xcb/src/Makefile.am.
Stop overwriting CFLAGS in xcb/src/Makefile.am.

topcat/xcb-win32,topcat/xcb-win32,topcat/xcb-win32,OpenInkpot-archive/iplinux-libxcb,OpenInkpot-archive/iplinux-libxcb,stapelberg/libxcb,stapelberg/libxcb,stapelberg/libxcb,OpenInkpot-archive/iplinux-libxcb,topcat/xcb-win32,topcat/xcb-win32