make intro awesome

build-gem5

@@ -10,11 +10,7 @@ import subprocess
 import common
 
 parser = common.get_argparse()
-parser.add_argument(
-    '-c', '--clean',
-    help='Clean the build instead of building.',
-    action='store_true',
-)
+common.add_build_arguments(parser)
 parser.add_argument(
     'extra_scons_args',
     default=[],