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

expose setgrent/getgrent/endgrent on fuchsia

Author: bors

src/fuchsia/mod.rs

@@ -4212,6 +4212,11 @@ extern "C" {
         child: ::Option<unsafe extern "C" fn()>,
     ) -> ::c_int;
     pub fn getgrgid(gid: ::gid_t) -> *mut ::group;
+
+    pub fn setgrent();
+    pub fn endgrent();
+    pub fn getgrent() -> *mut ::group;
+
     pub fn getgrouplist(
         user: *const ::c_char,
         group: ::gid_t,