NOT ACTUALLY MERGED meson: Add explicit check: kwarg to all run_command() calls
This is required since Meson 0.61.0, and causes a warning to be emitted otherwise:
https://github.com/mesonbuild/meson/commit/2c079d855ed87488bdcc6c5c06f59abdb9b85b6c
https://github.com/mesonbuild/meson/issues/9300
This exposed a bunch of places where we had broken run_command()
calls, unnecessary run_command()
calls, and places where check: true
should be used.