Made python3 recipe set ctx.cython

This is a temporary hack until cython setting is devolved properly.

Author: inclement

pythonforandroid/recipes/python3/__init__.py

@@ -22,6 +22,8 @@ def prebuild_arch(self, arch):
             print('Python3 already patched, skipping.')
             return
 
+        self.ctx.cython = 'cython'  # Temporary hack
+
         # # self.apply_patch(join('patches_inclement',
         # #                       'python-{version}-define_macro.patch'.format(version=self.version)))
         # # self.apply_patch(join('patches_inclement',