[Bug 261931] devel/credure: Add a crutch to build against libc++ 14

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261931

            Bug ID: 261931
           Summary: devel/credure: Add a crutch to build against libc++ 14
           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

I am working on the import of llvm 14 in
https://github.com/DimitryAndric/freebsd-src/tree/llvm-14-update; see also bug
261742 for the exp-run request.

One of the problematic ports is devel/creduce, since it still depends on
devel/llvm80, and this is not compatible with libc++ 14 anymore, since it now
requires support for __builtin_is_constant_evaluated() (see
https://github.com/llvm/llvm-project/commit/1123100a16a321d70508e2508ebc5d57ce7163dc
).

As a crutch, I've added a small header which defines a constexpr
__builtin_is_constant_evaluated() function, and include that at the top of
every compiled file, using -include, whenever the base system clang version is
14 or higher.

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