zlib: update homepage link

Avoid redirect.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/zlib/Config.in

@@ -4,4 +4,4 @@ config BR2_PACKAGE_ZLIB
 	  Standard (de)compression library. Used by things like
 	  gzip and libpng.
 
-	  http://www.gzip.org/zlib/
+	  http://www.zlib.net