Fix BSD errors (hopefully)

Author: ctrlcctrlv

libc-test/build.rs

@@ -664,6 +664,9 @@ fn main() {
             // the symbol.
             "uname" if freebsd => true,
 
+            // FIXME: need to upgrade FreeBSD version; see https://github.com/rust-lang/libc/issues/938
+            "setgrent" if freebsd => true,
+
             // aio_waitcomplete's return type changed between FreeBSD 10 and 11.
             "aio_waitcomplete" if freebsd => true,
 

src/unix/bsd/netbsdlike/mod.rs

@@ -642,7 +642,6 @@ extern {
                       buf: *mut ::c_char,
                       buflen: ::size_t,
                       result: *mut *mut ::passwd) -> ::c_int;
-    #[cfg_attr(target_os = "netbsd", link_name = "__getgrent_r50")]
     pub fn getgrent_r(grp: *mut ::group,
                       buf: *mut ::c_char,
                       buflen: ::size_t,