- Reformat per RFC-166;
- Update setup script to report on and offer to clean up obsolete mcfgthread DLL;
- Switch DXVK to thread model to Win32 from MCF; and
- Clean up Meson build configuration.
The `isCross` check is broken. When cross-compiling, it incorrectly
evaluates to false. DXVK has been building using the Meson
cross-compilation support in nixpkgs instead of with upstream’s cross
file. Instead of fixing `isCross`, just drop it as unnecessary.