package(games): QuakeSpasm, a Quake 1 source port

QuakeSpasm is a simple source port that primarily focuses on bug fixes and backwards compatibility.

Its build system is a small Makefile which required a few patches in order to compile on Redox. Currently, it compiles with both SDL1 and SDL2. MP3 support is hard disabled since neither libmad nor mpg123 would compile. However, the default OGG container and Vorbis decoder compiles fine.

Like Doom, Quake requires commercial assets or free replications in order to run. I'm currently trying to write a small recipe for the shareware files, but ironically that has more blockers than the source port itself.

Beyond the lack of content, I think this port is good to go.