[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 #6 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Yuri Victorovich from comment #5)

I see that 3.14.0 was building okay, so a new 3.15.0 issue?

Looking I found: qmcpack/CMake/Testlibstdc++.cmake which
suggests that they require libstdc++ :

# Test that if a C++ compiler is compatiable with the libstdc++ in use

But there are also:

ClangCompilers.cmake
GNUCompilers.cmake
IBMCompilers.cmake
IntelCompilers.cmake
NVHPCCompilers.cmake

So they seem to allow a variety of compilers, just when
compatibile with the libstdc++ in use.

I'm not aware of anyone having set up a FreeBSD clang++
context (system or ports) that allows for clang++ use
with a libstdc++ . As I understand, LLVM does allow for
providing -stdlib=libc++ and -stdlib=libstdc++ on the
same system, using the same compiler. So I expect setting
this up is a FreeBSD ports sort of activity, not an
upstream activity. I would not expect the system FreeBSD
to add libstdc++  (licensing issues, other issues).

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