Remove use of callable() from pickle to silence warnings under -3.

git-svn-id: http://svn.python.org/projects/python/trunk@65524 6015fed2-1504-0410-9fe1-9d1591cc4771

Author: brett.cannon

Lib/pickle.py

@@ -351,7 +351,7 @@ def save_reduce(self, func, args, state=None,
             raise PicklingError("args from reduce() should be a tuple")
 
         # Assert that func is callable
-        if not callable(func):
+        if not hasattr(func, '__call__'):
             raise PicklingError("func from reduce should be callable")
 
         save = self.save