SF bug #999776, zlib home page wrong

Backport candidate.
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py
index 81a4865..41abc5a 100644
--- a/Lib/test/test_gzip.py
+++ b/Lib/test/test_gzip.py
@@ -12,7 +12,7 @@
 """
 
 data2 = """/* zlibmodule.c -- gzip-compatible data compression */
-/* See http://www.cdrom.com/pub/infozip/zlib/ */
+/* See http://www.gzip.org/zlib/
 /* See http://www.winimage.com/zLibDll for Windows */
 """