So std lib seems to be wrong about this. but what to do? a lot of things just don't compile (looking at openssl) because of CString and CStr libstd says that `c_char` is `u8` https://github.com/rust-lang/rust/blob/b1363a73ede57ae595f3a1be2bb75d308ba4f7f6/src/libstd/os/raw.rs#L15 libc says that `c_char` is `i8` https://github.com/rust-lang/libc/blob/master/src/unix/notbsd/android/b32/x86.rs#L1