Xgl glyph private changes

[Eric Anholt]

Attached is the patch from xserver to add glyph privates.  These are
useful for DDXes like Xgl to put glyphs into a cache, which EXA may be
interested in as well.

However, it's going to break ABI for anybody doing their own Glyphs
handler, since when interacting with a Glyph you have to step just
beyond the end of the Glyph structure to get at the data (ewww).  So we
can't add the pointer to the privates without breaking ABI for
drivers/DDXes compiled against the old headers, which will include EXA,
XAA, and probably NVIDIA proprietary.

What do people think?  Is this an appropriate time for this patch to go
in?

-- 
Eric Anholt                                     eta at lclark.edu
http://people.freebsd.org/~anholt/              anholt at FreeBSD.org
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