Update generated files to match 21.3.7.

Created using a dummy pkg.

Add more generated files from mesa 19.1.7.

Generated by doing a regular build using pkgsrc.

Remove now unused generated files.

Update generated files from a regular build of mesa 19.1.7.

The pkgconfig files are now generated using meson, no more .pc.in files,
so I made my own using the result of the pkgsrc build.

remove files not wanted for mesa 18.

generated files for mesa 18.3.4.

this work from maya@ via this github commit:

commit 9eeee3fcb33a84ebc1653c032f57e7193b7b7236
Author: Maya Rashish <maya@NetBSD.org>
Date: Sat Feb 23 23:14:48 2019 +0200

Generated files for mesa 18.3.4

various generated files needed for mesa 10.3.5.

most are generated from python, a couple of app generators (hard to
run as they output offsets for objects), and a bison output yacc
didn't like the input for..