This patch prevents the rebuild of OpenCC while installing the python binding.

Author: Zhu Zihao <all_but_last@163.com>
--- a/python/setup.py
+++ b/python/setup.py
@@ -195,7 +195,6 @@
         'clib/share/opencc/*',
     ]},
     cmdclass={
-        'build_py': BuildPyCommand,
         'bdist_wheel': BDistWheelCommand
     },