merge mesa 21.3.7.

Merge mesa 19.1.7

prevent re-definitions from drm.h

from maya:

Import mesa 18.3.4.

Mesa 18.3.4 implements the OpenGL 4.5 API.
Some drivers don't support all the features required in OpenGL 4.5.

initial import of MesaLib-10.3.5

import MesaLib 7.11.2

Brings in support for Intel Sandy Bridge and Ivy Bridge hardware, a
new shader language compiler, and various other improvements too
numerous to list here; see <http://www.mesa3d.org/relnotes.html> for
details.

import Mesa 7.8.2, lib part. major changes since 7.7.1:
- several new extensions for various drivers
- many i965, i915 driver fixes
- many glsl fixes

initial import of MesaLib-7.7.1

initial import of MesaLib-7.4.2

initial import of MesaLib-7.0.3