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

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).