Auto merge of #2910 - SteveLauC:expose-setgrent-getgrent-endgrent-on-fuchsia, r=JohnTitor
Auto merge of #2910 - SteveLauC:expose-setgrent-getgrent-endgrent-on-fuchsia, r=JohnTitor

expose setgrent/getgrent/endgrent on fuchsia

rust-lang/libc,rust-lang/libc,rust-lang/libc