[Bug libstdc++/127219] <format>: make __valid_types_for_check_dynamic_spec static so check_dynamic_spec<Ts...> works with clang and EDG

[stevensudit at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127219

--- Comment #2 from Steve Sudit <stevensudit at gmail dot com> ---
Created attachment 65509
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65509&action=edit
patch against trunk: declare __valid_types_for_check_dynamic_spec static