[Bug 266748] '#include <memory_resource>' isn't available despite it being required by c++17

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266748

--- Comment #4 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Yuri Victorovich from comment #3)

The various:

https://en.cppreference.com/w/cpp/compiler_support/*

are good thing to look at when the default environment seems
to have insufficient features. The pages also cover "GCC
libstdc++" in addition to "Clang libc++", as well as core
language features for GCC and for Clang.

For officially released vintages of the C++ standard, GCC
and GCC libstdc++ tend to have more complete coverage in
some version than LLVM clang++ and its libc++ does.

For either LLVM or GCC, the vintage may at times need to be
newer than the FreeBSD ports available or the system-clang++
version in FreeBSD's main [so: in 14 currently].

libc++ does not have port-specific versions, however. The
LLVM ports use the system's libc++ . This can also lead to
GCC libstdc++ having better language coverage for more
modern C++ vintages.

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