Bug 1142458 - Make MACOSX_DEPLOYMENT_TARGET part of the cache key. r=…

…mshal

The MACOSX_DEPLOYMENT_TARGET environment variable can influence the result of
compilation. As such, its value should be part of the cache key.

server.py

@@ -231,6 +231,10 @@ def hash_key(compiler, args, preprocessed):
     # modified by code changes (e.g. adding more data)
     h.update(str(CacheData.VERSION))
     h.update(' '.join(args))
+    osx_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET')
+    if osx_target:
+        h.update('MACOSX_DEPLOYMENT_TARGET=')
+        h.update(osx_target)
     h.update(preprocessed)
     return h.hexdigest()