Ubuntu build script now also builds pixman / BGRA update

[Darxus at chaosreigns.com]

Cairo (git) recently bumped the version of pixman it depends on to
something newer than what's in Ubuntu Maverick, so my script is now also
building pixman from git:  http://www.chaosreigns.com/wayland/ubuntu.html


Also, bnf posted another set of (4) patches to the mesa list,
which does make wayland work for me with nouveau/nvidia (fixes the
"GL_EXT_texture_format_BGRA8888 not available" problem for non-Intel
cards):
http://www.mail-archive.com/mesa-dev@lists.freedesktop.org/msg04877.html

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