Add more mips syscall numbers
Add more mips syscall numbers

As per: lib/libc/musl/arch/mips/bits/syscall.h.in

...and as promised: https://github.com/ziglang/zig/pull/6356#issuecomment-696023349

Thanks @daurnimator again for the help with #6356.

zig-lang/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig