Get rid of warning about GTK3Agg with python3

jenshnielsen · jenshnielsen · commit cd6562da2099 · 2014-07-14T18:21:59.000-05:00
This has been fixed by using cairocffi according to #1227
diff --git a/setupext.py b/setupext.py
@@ -1711,9 +1711,6 @@ def check_requirements(self):
         if 'TRAVIS' in os.environ:
             raise CheckFailed("Can't build with Travis")
 
-        if PY3:
-            raise CheckFailed("gtk3agg backend does not work on Python 3")
-
         # This check needs to be performed out-of-process, because
         # importing gi and then importing regular old pygtk afterward
         # segfaults the interpreter.
