[Bug libstdc++/101136] msdosdjgpp toolchain cannot find std::wstring_view

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101136

--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
However, std::basic_string_view<wchar_t> works.