libxslt: correct homepage link

Link to the actual webpage of libxslt, not to the xslt spec page.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libxslt/Config.in

@@ -13,4 +13,4 @@ config BR2_PACKAGE_LIBXSLT
 	  to describe how the document is transformed into another
 	  XML document that uses the formatting vocabulary.
 
-	  http://www.w3.org/TR/xslt
+	  http://xmlsoft.org/xslt/