Bug 1429819: Allow using tooltool macOS SDK on all automation builds and all cross-builds. r=dminor

The original logic I wrote had the condition backwards.

MozReview-Commit-ID: IFIS8vZLgd4

--HG--
extra : rebase_source : 9f9baeb2f6284c551fb63f139d6f5942569890fd

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

@@ -84,7 +84,7 @@ def main():
 
 
 if __name__ == '__main__':
-  if sys.platform == 'darwin' or os.environ.get('MOZ_AUTOMATION') != '1':
+  if sys.platform == 'darwin' and os.environ.get('MOZ_AUTOMATION') != '1':
     print main()
   else:
     # Mozilla builds cross-compile on Linux or install an SDK from tooltool, so