checking for enum_class_Proxy instead of PARROT_HAS_THREADS

In parrot 4.4.0 enum_class_Proxy isnt defined but PARROT_HAS_THREADS is. So enum_class_Proxy would be added to the condition.

Author: FROGGS

src/pmc/nqplexpad.pmc

@@ -109,10 +109,10 @@ Return the LexInfo PMC, if any or a Null PMC.
         Hash *hash;
         GET_ATTR_lexinfo(INTERP, SELF, info);
         if (info->vtable->base_type != enum_class_LexInfo
-#ifdef PARROT_HAS_THREADS
+#ifdef enum_class_Proxy
             && info->vtable->base_type != enum_class_Proxy
 #endif
-	    ) {
+        ) {
             PMC *name_map;
             GETATTR_NQPLexInfo_name_to_register_map(INTERP, info, name_map);
             hash = (Hash *)VTABLE_get_pointer(INTERP, name_map);