Managing C dependencies with gyro

[LordMZTE]

I believe it would be very handy for gyro to have the ability to handle C libraries in the form of git repositories.

I think a very elegant solution would be, to be able to specify a URL for a C git repository in gyro.zzz, and to have a path to the place gyro cloned it end up in deps.zig, so the build script can manage the C dependency itself.

[mattnite]

I really like this idea, it's just the bare minimum functionality you need in order to do write reusable build scripts