[Bug 277280] sysutils/coreutils: fix build with clang 18

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277280

            Bug ID: 277280
           Summary: sysutils/coreutils: fix build with clang 18
           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: jharris@widomaker.com
             Flags: maintainer-feedback?(jharris@widomaker.com)
                CC: jharris@widomaker.com

Clang 18 has become more stringent about use of checked integer
operations, resulting in errors when building sysutils/coreutils:

  lib/posixtm.c:194:15: error: operand argument to checked integer operation
must be an integer type other than plain 'char', 'bool', bit-precise, or an
enumeration ('bool' invalid)
    194 |           if (ckd_add (&t, t, leapsec))
        |               ^~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/stdckdint.h:16:37: note: expanded from macro 'ckd_add'
     16 |         (_Bool)__builtin_add_overflow((a), (b), (result))
        |                                            ^~~

The actual issue is the gnulib part of coreutils, which is a separate
GNU project. That project has already identified and fixed it:

https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=67c298c36f6

Apply the fix to fix the build with clang 18.

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