Fix the pragmas for Wcast-qual with old gcc versions

cJSON.c

@@ -1580,6 +1580,10 @@ CJSON_PUBLIC(void) cJSON_AddItemToObject(cJSON *object, const char *string, cJSO
     item->type &= ~cJSON_StringIsConst;
 }
 
+#if defined (__clang__) || ((__GNUC__)  && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5))))
+    #pragma GCC diagnostic push
+#endif
+#pragma GCC diagnostic ignored "-Wcast-qual"
 /* Add an item to an object with constant string as key */
 CJSON_PUBLIC(void) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item)
 {
@@ -1591,13 +1595,13 @@ CJSON_PUBLIC(void) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJ
     {
         global_hooks.deallocate(item->string);
     }
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-qual"
     item->string = (char*)string;
-#pragma GCC diagnostic pop
     item->type |= cJSON_StringIsConst;
     cJSON_AddItemToArray(object, item);
 }
+#if defined (__clang__) || ((__GNUC__)  && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5))))
+    #pragma GCC diagnostic pop
+#endif
 
 CJSON_PUBLIC(void) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item)
 {