Ignore the type. Fixes emergent qa failure and closes python#72.

Author: jaraco

importlib_resources/_compat.py

@@ -20,4 +20,4 @@ class ABC(object):                                          # type: ignore
 try:
     FileNotFoundError = FileNotFoundError                       # type: ignore
 except NameError:
-    FileNotFoundError = OSError
+    FileNotFoundError = OSError                                 # type: ignore