{libGL,libGLU}: use the OpenGL framework on Darwin

This reduces the reverse closure of Mesa on Darwin considerably. As
a result, we can also drop the Mesa stubs package entirely, as its
output on Linux is functionally identical to libglvnd.

It should no longer be necessary for packages to switch between libGL
and darwin.apple_sdk.frameworks.OpenGL depending on the platform.

A cross‐platform libGLX alias is added for packages that specifically
need it (mostly old X11 applications that barely know what a macOS is).

Co-authored-by: K900 <me@0upti.me>

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