[Bug 280696] net/kea: fix build with libc++ 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280696

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=eddc2f815b3fac6d363e93e7f9ec4dabc816b0c9

commit eddc2f815b3fac6d363e93e7f9ec4dabc816b0c9
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-08-08 18:34:30 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-08-09 17:34:46 +0000

    net/kea: fix build with libc++ 19

    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 net/kea to fail to compile with clang 19 and libc++ 19,
    resulting in errors similar to:

        In file included from edns.cc:9:
        In file included from ../../../src/lib/exceptions/exceptions.h:11:
        /usr/include/c++/v1/string:820:42: error: implicit instantiation of
undefined template 'std::char_traits<unsigned char>'
          820 |   static_assert(is_same<_CharT, typename
traits_type::char_type>::value,
              |                                          ^
        ../../../src/lib/dns/name.h:727:16: note: in instantiation of template
class 'std::basic_string<unsigned char>' requested here
          727 |     NameString ndata_;
              |                ^
        /usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared
here
           23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
              |                             ^

    `NameString` is defined as `std::basic_string<unsigned char>`, which is
    no longer possible. So redefine it as a `std::vector<unsigned char>`
    instead.

    This requires a few adjustments in other places: adjusting the arguments
    for the `assign()` method, which for `std::vector` takes a begin and end
    iterator, instead of a begin iterator and a size, and replacing the
    `append()` method with an equivalent `insert()`.

    These changes have also been sent upstream [2].

    [1] https://libcxx.llvm.org/ReleaseNotes/19.html#deprecations-and-removals
    [2] https://gitlab.isc.org/isc-projects/kea/-/merge_requests/2410

    PR:             280696
    Approved by:    apevnev@me.com (maintainer)
    MFH:            2024Q3

 net/kea/files/patch-src_lib_dns_name.cc (new) | 56 +++++++++++++++++++++++++++
 net/kea/files/patch-src_lib_dns_name.h (new)  | 11 ++++++
 2 files changed, 67 insertions(+)

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