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.

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