Moved -Wparentheses suppression before the push for GCC

Because of bugs in GCC 4 & 5 that prevent _Pragma from working :-(

include/internal/catch_suppress_warnings.h

@@ -18,7 +18,7 @@
 #    endif
 #elif defined __GNUC__
 #    pragma GCC diagnostic ignored "-Wunused-variable"
-#    pragma GCC diagnostic push
 #    pragma GCC diagnostic ignored "-Wparentheses"
+#    pragma GCC diagnostic push
 #    pragma GCC diagnostic ignored "-Wpadded"
 #endif