wrap entire header in ignore pragma

this would be preferable to spreading -Wno-deprecated-declarations
 to all targets using velox_typ

velox/type/Type.h

@@ -23,7 +23,6 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #include <folly/json.h>
-#pragma GCC diagnostic pop
 #include <cstdint>
 #include <cstring>
 #include <ctime>
@@ -2423,3 +2422,4 @@ struct fmt::formatter<
     return format_to(ctx.out(), "{}", k->toString());
   }
 };
+#pragma GCC diagnostic pop