Merge branch 'cosmo' into cosmo-apperl 

enable getgroups, setgroups, getlogin, remove several overrides from … …cosmo hints jart/cosmopolitan@aab4ee4 fixed unimplemented for all platforms cosmopolitan syscalls from being detected by Configure and implemented getlogin jart/cosmopolitan@4c40c50 added getgroups, setgroups, fix Configure detection of gid_t and uid_t