meta: try to get around an issue with g++9

Author: skypjack

src/entt/meta/meta.hpp

@@ -39,7 +39,7 @@ class meta_sequence_container {
     using iterator = meta_iterator;
 
     /*! @brief Default constructor. */
-    meta_sequence_container() noexcept = default;
+    meta_sequence_container() = default;
 
     /**
      * @brief Context aware constructor.