Mark error functions as _Noreturn.
Merge branch 'master' of https://github.com/stag019/rgbds
Specify _Noreturn in the err family prototypes.
Use POSIX 2001 as the base standard.
Don’t assign to self.
On Clang, error on implicit function declaration by default.
We aren't kidding ourselves anymore. This is a Gameboy assembler, not any sort of generic assembler.