BUG: cythonize sources for wheel build

Wheel build was not cythonizing sources, giving a compile error because
needed `numpy/random/mtrand/mtrand.c` was missing.

Author: matthew-brett

setup.py

@@ -228,12 +228,10 @@ def setup_package():
 
         FULLVERSION, GIT_REVISION = get_version_info()
         metadata['version'] = FULLVERSION
-    elif len(sys.argv) >= 2 and sys.argv[1] == 'bdist_wheel':
-        # bdist_wheel needs setuptools
-        import setuptools
-        from numpy.distutils.core import setup
-        metadata['configuration'] = configuration
     else:
+        if len(sys.argv) >= 2 and sys.argv[1] == 'bdist_wheel':
+            # bdist_wheel needs setuptools
+            import setuptools
         from numpy.distutils.core import setup
         cwd = os.path.abspath(os.path.dirname(__file__))
         if not os.path.exists(os.path.join(cwd, 'PKG-INFO')):