Minor XAA cleanups & compiler warning quieting
- Quiet
-Wredundant-declsfromxorg/os.hfallbacks for new libc functions - Don't try to load
xaamodule if not compiled with XAA support - man page: stop claiming to use XAA on Xorg 1.13 & later
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-Wredundant-decls from xorg/os.h fallbacks for new libc functionsxaa module if not compiled with XAA support