Bug 1843201 - Fix too broad OS check for webrtc default after bug 1841585. r=firefox-build-system-reviewers,sergesanspaille

Differential Revision: https://phabricator.services.mozilla.com/D183448

toolkit/moz.configure

@@ -1362,7 +1362,6 @@ def webrtc_default(target):
     os_match = target.kernel in (
         "Linux",
         "WINNT",
-        "Darwin",
         "DragonFly",
         "FreeBSD",
         "kFreeBSD",
@@ -1370,6 +1369,9 @@ def webrtc_default(target):
         "OpenBSD",
     )
 
+    if not os_match:
+        os_match = target.os in ("OSX",)
+
     cpu_match = target.cpu in (
         "x86_64",
         "arm",