applying DRY on cython vs Cython

import the ``cython`` as module (no run  as a program)::

   >>> import cython

do the same than::

   >>> import Cython

But the same code was repeated in both places.

cython.py

@@ -17,7 +17,4 @@ if __name__ == '__main__':
     main(command_line = 1)
 
 else:
-    # Void cython.* directives.
-    from Cython.Shadow import *
-    ## and bring in the __version__
-    from Cython import __version__
+    from Cython import *
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