Bug 1429819: Allow using tooltool macOS SDK on all automation builds, not just cross-builds; r=dminor

MozReview-Commit-ID: IFIS8vZLgd4

--HG--
extra : rebase_source : 5494d93404e5fff0c669df2540534456579f9acf

media/webrtc/trunk/build/mac/find_sdk.py

@@ -84,11 +84,12 @@ def main():
 
 
 if __name__ == '__main__':
-  if sys.platform == 'darwin':
+  if sys.platform == 'darwin' or os.environ.get('MOZ_AUTOMATION') != '1':
     print main()
   else:
-    # Mozilla builds cross-compile on Linux, so return some fake data to keep
+    # Mozilla builds cross-compile on Linux or install an SDK from tooltool, so
-    # the build system happy. These values aren't used anywhere.
+    # return some fake data to keep the build system happy. These values aren't
+    # used anywhere.
     print "."
     print "."
   sys.exit(0)