Call other.__eq__ in irclib.Irc.__eq__ instead of using the == comparator.

Here, this operator is not reflexive, and Python 3 calls the second members resulting in a stack overflow.

src/irclib.py

@@ -1073,7 +1073,7 @@ class Irc(IrcCommandDispatcher):
         if isinstance(other, self.__class__):
             return id(self) == id(other)
         else:
-            return other == self
+            return other.__eq__(self)
 
     def __ne__(self, other):
         return not (self == other)