[Bug 292867] devel/build2: fix build with libc++ >= 20

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292867

            Bug ID: 292867
           Summary: devel/build2: fix build with libc++ >= 20
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: fuz@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(fuz@FreeBSD.org)
          Assignee: fuz@FreeBSD.org

With libc++ 20 or higher devel/build2 fails to build, with errors
similar to:

    In file included from libbuild2/utility.cxx:27:
    ./libbuild2/script/regex.hxx:620:10: error: 'make_unsigned' cannot be
specialized: Users are not allowed to specialize this standard library entity
[-Winvalid-specialization]
      620 |   struct make_unsigned<build2::script::regex::line_char>
          |          ^
    /usr/include/c++/v1/__type_traits/make_unsigned.h:75:8: note: marked
'_Clang::no_specializations' here
       75 | struct _LIBCPP_NO_SPECIALIZATIONS make_unsigned {
          |        ^
    /usr/include/c++/v1/__config:1167:9: note: expanded from macro
'_LIBCPP_NO_SPECIALIZATIONS'

Upstream committed a fix for this in
https://github.com/build2/build2/commit/7cf9cec, so add that as a patch
file.

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