merge xorg-server 21.1.16.

fix build issues for sparc64. mostly constification.

first merge of netbsd changes. not tested yet.

add a field to struct sbus_device which records the framebuffer size reported
by ioctl(FBIOGATTR) so drivers can use it

when using dixSetPrivate() and friends it helps to initialize the key before
using it. Now colours on suncg6 look right again and we don't spin or crash
on exit anymore.
probably needs to be pulled into -6

merge cornflakes with xorg-server 1.10.3

make this compile on sparc64

import xorg-server 1.9.2. important changes since 1.6.5 include:

- built-in symbol visibility, default not export
- fixes for various crashes
- many fixes for XI2, EXA, dix, render, glx, xkb, EDID, randr, Xv,
resource handling, Xext, vfb, xfree86 / vga and composite support.
- fixes several memory leaks
- many many documentation updates
- record extension enabled
- no longer looks for XF86Config files

initial import of xorg-server-1.6.1.901

initial import of xorg-server-1.4.2