Update version to 10.2.3-1

Update version to 10.2.3-1
Remove patches which have been upstreamed or are redundant
Remove 7.10.1-glean-quick.patch which wasn't used
Add needed patches for building
GLU is now in it's own repository
Properly autotooled, so makedepend and lndirs are no longer required
libexpat1-devel is obsolete, superseded by libexpat-devel
Include /etc/drirc in dri_drivers package
builtin_compiler should be working correctly when cross-compiling (untested)
Install all files linked to in html documentation files

Issues/Questions:

fedora patches don't seem to apply, but seem to be still being used in current
fedora package!

M_PI patch: the proper way to fix this is to make newlib's math.h define M_PI if
!STRICT_ANSI || _XOPEN_SOURCE