merge xorg-server 1.20.3.

apply
https://cgit.freedesktop.org/xorg/xserver/commit/?id=2855f759b1e7bf7f5e57cac36c1f0d0e5ac1a683


auth: remove AuthToIDFunc and associated functions. Not used anymore.
And the current code for MitToId has a use-after-free() issue.

[Also remove the actual implementations - ajax]

Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>

initial import of xorg-server-1.18.4

initial import of xorg-server 1.10.3. highlights include:
- fixes xorg bugs 29969, 30367, 30527, 30267, 30260, 29046,
30260, 31548, 28672, 24887, 32115, 21457, 32436, 21827,
28414, 24703, 32803, 16318, 33449, 33324, 33929, 35082,
35209, 36146, 36119
- many additional NULL checks
- adjustments related to input ABI 12
- *lots* of dead code removal
- vga arbitrator fixes
- GL fixes
- EDID fixes
- conversion to using asprintf() in many places
- many fixes from valgrind, compiler warnings

see these for more details:
http://lists.freedesktop.org/archives/xorg-announce/2011-February/001612.html
http://lists.freedesktop.org/archives/xorg-announce/2011-April/001646.html
http://lists.freedesktop.org/archives/xorg-announce/2011-May/001675.html
http://lists.freedesktop.org/archives/xorg-announce/2011-July/001710.html

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