Fix comparison for classes implementing __eq__.

There are currently only two new failing tests:

* Comparing an object with a proxy of the object fails (but comparing the proxy with the object is fine!)
* Comparing a proxy with itself fails

But these tests run fine when deleting the `__eq__` method on the `Something` class which is the class of `self.x`.

Author: Michael Howitz

src/zope/security/tests/test_proxy.py

@@ -1808,9 +1808,15 @@ def testCallOK(self):
     def testCallFail(self):
         self.shouldFail(self.p, None)
 
-    def testRichCompareOK(self):
+    def testRichCompareProxyWithObjectOK(self):
         self.assertTrue(self.p == self.x)
 
+    def testRichCompareObjectWithProxyOK(self):
+        self.assertTrue(self.x == self.p)
+
+    def testRichCompareWithProxyWithProxyOK(self):
+        self.assertTrue(self.p == self.p)
+
 ##     def testRichCompareFail(self):
 ##         self.shouldFail(lambda: self.p == self.x)