std::list implementation define _GLIBCXX20_ONLY incorrectly

In file bits/list.tcc, the _GLIBCXX20_ONLY is declared as forward if __cplusplus > 201703L, but in bits/stl_list.h the __remove_return_type is declared as size_type if __glibcxx_list_remove_return_type. Thus when building in freestanding mode, the return statements would cause errors.

gcc 14.2 newlib 4.4.0.20231231
host x86_64-linux-elf target i686-elf freestanding
I’ve defined _REQUIRES_FREESTANDING_H before the header to bypass bits/requires_hosted.h restriction.

bits/stl_list.h

#ifdef __glibcxx_list_remove_return_type // C++ >= 20 && HOSTED
      typedef size_type __remove_return_type;
# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG \
      __attribute__((__abi_tag__("__cxx20")))
#else
      typedef void __remove_return_type;
# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
#endif

bits/list.tcc

#if __cplusplus > 201703L
# define _GLIBCXX20_ONLY(__expr) __expr
#else
# define _GLIBCXX20_ONLY(__expr)
#endif