Fix another typo.

benchmarks/asmjs-ubench/harness.py

@@ -73,7 +73,7 @@ def main(argv):
 
     if len(args) < 1 and not options.native:
         print("Usage: ")
-        print("  --native [--cc=] [--cxx] [-- flags]")
+        print("  --native [--cc=] [--cxx=] [-- flags]")
         print("  <shell> [-- options]")
         return sys.exit(1)