merge xf86-video-ati 22.0.0.

various updates to build against xorg-server 21.1.3.

- avoid a const issue with an expanded __UNCONST().
- cope with renamed member names
- deal with "xf86RamDac.h" going away (now use "xf86Cursor.h")

initial import of xf86-video-ati-18.0.0

initial import of xf86-video-ati-7.8.0

initial import of xf86-video-ati-6.14.6

initial import of xf86-video-ati-7.8.0

initial import of xf86-video-ati 7.5.0 sources, into a new subdir as
this only has a chance of working on systems with KMS -- -7 on x86
only, so we need to keep the 6.x around for everyone else.