[Bug 282525] x11-wm/blackbox: fix build with libc++ 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282525

            Bug ID: 282525
           Summary: x11-wm/blackbox: fix build with libc++ 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org
                CC: A.J.Caines@halplant.com
                CC: A.J.Caines@halplant.com
             Flags: maintainer-feedback?(A.J.Caines@halplant.com)

As noted in the libc++ 19 release notes [1], std::char_traits<> is now
only provided for char, char8_t, char16_t, char32_t and wchar_t, and any
instantiation for other types will fail.

This causes x11-wm/blackbox to fail to compile with clang 19 and libc++
19, resulting in errors similar to:

  /usr/include/c++/v1/string:820:42: error: implicit instantiation of undefined
template 'std::char_traits<unsigned int>'
    820 |   static_assert(is_same<_CharT, typename
traits_type::char_type>::value,
        |                                          ^
  ./Menu.hh:82:13: note: in instantiation of template class
'std::basic_string<unsigned int>' requested here
     82 |     ustring lbl;
        |             ^
  /usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
     23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
        |                             ^

This can be fixed by defining `Uchar` as `char32_t` instead of `unsigned
int` in `Unicode.hh`.

[1] https://libcxx.llvm.org/ReleaseNotes/19.html#deprecations-and-removals

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