Sunpro can't cope with latest is_base_and_derived implementation

added gcc warning suppression to is_class


[SVN r17911]

libs/type_traits

@@ -1 +1 @@
-Subproject commit 3013105b1e2c64c00240886e4c868a853d67e7f4
+Subproject commit bf70e2aced03f5de07dfc6c095bffd719c1bfd3b