porting revision 74098 from trunk:
http://bugs.python.org/issue6499
zlib/gzip may not be present for all builds.  Make xmlrpclib gracefully not supporg gzip encoding in this case
diff --git a/Lib/test/test_xmlrpc.py b/Lib/test/test_xmlrpc.py
index fab000d..3ea2e1b 100644
--- a/Lib/test/test_xmlrpc.py
+++ b/Lib/test/test_xmlrpc.py
@@ -799,7 +799,11 @@
     xmlrpc_tests.append(SimpleServerTestCase)
     xmlrpc_tests.append(KeepaliveServerTestCase1)
     xmlrpc_tests.append(KeepaliveServerTestCase2)
-    xmlrpc_tests.append(GzipServerTestCase)
+    try:
+        import gzip
+        xmlrpc_tests.append(GzipServerTestCase)
+    except ImportError:
+        pass #gzip not supported in this build
     xmlrpc_tests.append(ServerProxyTestCase)
     xmlrpc_tests.append(FailingServerTestCase)
     xmlrpc_tests.append(CGIHandlerTestCase)