Function wasi::wasi_unstable::path_open

pub fn path_open(
    dirfd: Fd, 
    dirflags: LookupFlags, 
    path: &[u8], 
    oflags: OFlags, 
    fs_rights_base: Rights, 
    fs_rights_inheriting: Rights, 
    fs_flags: FdFlags
) -> (Errno, Fd)