:yakkie:
The build process for the Zig compiler is more involved than most of
the other ports, because the Zig compiler is mostly self-hosting. In
order to build it, the zig-bootstrap build system is used, which does
the following:
1) Build LLVM for the host OS;
2) Build Zig for the host OS with the SerenityOS target enabled;
3) Build zlib, zstd and LLVM for SerenityOS using `zig cc` as the C/C++
compiler;
4) Build Zig for SerenityOS using the host Zig.
A few hacks are required in order to tell `zig cc` and zig about what
Serenity's libc looks like in the build process, but other than that
it's fairly straightforward. All of the patches that are included with
this commit are Zig-upstream ready once the LLVM patches are upstreamed.
This now requires `--host` and `--with-build-python` to be passed to the
configure script when cross compiling; the former we simply do like in
many other package.sh scripts as well, the latter we point to `python3`,
which is expected to match the port's version anyway.
Per the release notes for 1.5.0, the CMake build is preferred going
forward. This lets us drop some Makefile patches and pass them as CMake
options instead, with the exception of disabling mold-wrapper.so.
Music (MIDI) works through TiMidity++ and OpenGL support works, but is
still very buggy. Sometimes PrBoom+ fails to load its own configuration
file, which can be worked around by deleting it.
Also add it as a dependency for the `SDL_mixer` and `SDL2_mixer` ports.
Eawpats GUS patches are installed as part of the port, because without
patches TiMidity++ is not able to generate any sound. The license for
these is "fameware", credit to Andrew Suffield:
https://lists.debian.org/debian-legal/2002/09/msg00137.html
