[Bug 285063] Upgrade via src to 14.2S blocked by lib/libc++ requiring std=c++23

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285063

            Bug ID: 285063
           Summary: Upgrade via src to 14.2S blocked by lib/libc++
                    requiring std=c++23
           Product: Base System
           Version: 14.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: dewayne@heuristicsystems.com.au

Attempting a src upgrade to 14.2S from either 13.2 or 14.1 failed due to 
/usr/src/lib/libc++/Makefile specifying the use of
CXXSTD?=      c++23

clang 16.0.6 and earlier do not support std=c++23. 

Manually forcing std=c++20 enabled a 14.2S buildworld to complete.

Perhaps something like
if ( ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} < 130000 ) ||
${COMPILER_VERSION} < 170000 
should replace
.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} < 130000

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