move ffb_fastfill_parms to ffb_accel_common.c so the EXA code can work
without XAA

partial port to xorg-server 1.18. both cg6 and ffb need more help.

- move some routines used by both XAA and EXA to their own file
- enable hardware prefetch when reading from video memory - now blits in EXA
are no longer slower than in XAA
- start fleshing out Xrender routines

add basic EXA support

merge xf86-video-suncg14 1.1.2, xf86-video-suncg6 1.1.2,
xf86-video-sunffb 1.2.2, xf86-video-suntcx 1.1.2 and xf86-video-sunleo 1.2.1

XXX: these might need more help

Catch up with changes in XAA that rendered our RENDER acceleration code
non-functional. While there, fix VSCROLL support to disable alpha blending
in order to avoid those bluish-greenish artifacts we'd get otherwise when
doing a VSCROLL right after a RENDER op.

the sunffb driver