A lot of this is more broadly supported than just Linux, but support for
those can be added later.

This reverts commit c124acba.

Add network interface flag constants for all platforms.

These aren't exposed on non-MIPS musl targets, but since they're
part of a kernel API, they're still applicable, so we just don't
test them there but expose them anyways.

Error was "bad pthread_cancel function pointer: rust: 8362822 (0x7f9b46) != c 8358779 (0x7f8b7b)"

Note that termios2 doesn't exist on powerpc(64), termios
is used instead.

* Add syscall tables to most remaining arches in `src/unix/notbsd`
* Add aarch64/arm musl to CI
* Update dependencies

pthread_cancel() is safer way to terminate thread than pthread_kill().

This function can be found from ISO/IEC 9945-1:1996 (“POSIX.1”) and
first introduced into Single Unix Specification version 2 on 1997.

powerpc64 was missing in musl/mod.rs and making build fail
as it was not able to find types, like c_char.

Motivation: there is no glibc wrapper for this syscall