Metal Support contributed by Migeran (https://migeran.com) and Stuart Carnie.
Co-authored-by: Stuart Carnie <stuart.carnie@gmail.com>
Co-authored-by: Gergely Kis <gergely.kis@migeran.com>
This was added together with `ppc64le` in #54490, but seemingly only for the
purpose of getting it to compile on a Linux distro that aims at maximizing
support for all CPU architectures.
I don't think anyone has ever _run_ Godot on a `ppc32` system (do those even
support OpenGL ES 3.0?) and so I don't think we should aim to support it.
Debian dropped support for its PowerPC (`ppc32`) arch in Debian 9, released
in 2017.
We don't use that info for anything, and it generates unnecessary diffs
every time we bump the minor version (and CI failures if we forget to
sync some files from opt-in modules (mono, text_server_fb).
