Drop ancient Python 2.3 support which used deprecated unittest apis.
diff --git a/OpenSSL/test/util.py b/OpenSSL/test/util.py
index 604a7c2..2096fd5 100644
--- a/OpenSSL/test/util.py
+++ b/OpenSSL/test/util.py
@@ -288,15 +288,6 @@
         return temp
 
 
-    # Python 2.3 compatibility.
-    def assertTrue(self, *a, **kw):
-        return self.failUnless(*a, **kw)
-
-
-    def assertFalse(self, *a, **kw):
-        return self.failIf(*a, **kw)
-
-
     # Other stuff
     def assertConsistentType(self, theType, name, *constructionArgs):
         """