o use internal freetype2 for consistency with x11/XFree86-4.
o added xthreads obtained from x11/XFree86-4.
o install "ws" type config sample for xdm.
o build DRI only if kernel source installed in /sys.
o fix Riva128/SGRAM driver(patch-riva_hw.c).
PR: 24338(4.0.2)
Submitted by: maintainer, keith
