Remove thread-safety exemption for MacOS

See #610 for details.

Author: jhpratt

tests/utc_offset.rs

@@ -178,7 +178,6 @@ fn current_local_offset() {
 #[test]
 #[cfg_attr(
     any(
-        target_os = "macos",
         target_os = "netbsd",
         target_os = "illumos",
         not(target_family = "unix")

time/src/sys/local_offset_at/unix.rs

@@ -15,9 +15,6 @@ const OS_HAS_THREAD_SAFE_ENVIRONMENT: bool = match std::env::consts::OS.as_bytes
     // https://github.com/NetBSD/src/blob/f45028636a44111bc4af44d460924958a4460844/lib/libc/stdlib/getenv.c
     // https://github.com/NetBSD/src/blob/f45028636a44111bc4af44d460924958a4460844/lib/libc/stdlib/setenv.c
     | b"netbsd"
-    // https://github.com/apple-oss-distributions/Libc/blob/d526593760f0f79dfaeb8b96c3c8a42c791156ff/stdlib/FreeBSD/getenv.c
-    // https://github.com/apple-oss-distributions/Libc/blob/d526593760f0f79dfaeb8b96c3c8a42c791156ff/stdlib/FreeBSD/setenv.c
-    | b"macos"
     => true,
     _ => false,
 };