[Bug 271931] The C++20 feature 'std::ranges::copy' is missing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271931

--- Comment #7 from Dimitry Andric <dim@FreeBSD.org> ---
Upstream implemented std::ranges::for_each here:
https://github.com/llvm/llvm-project/commit/80045e9afa2f3545d3b1f2d06090a9a053a90307

However, the feature is gated behind a `_LIBCPP_HAS_NO_INCOMPLETE_RANGES`
define, currently enabled by default in /usr/include/c++/v1/__config:

// Incomplete features get their own specific disabling flags. This makes it
// easier to grep for target specific flags once the feature is complete.
#  if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) &&
!defined(_LIBCPP_BUILDING_LIBRARY)
#    define _LIBCPP_HAS_NO_INCOMPLETE_FORMAT
#    define _LIBCPP_HAS_NO_INCOMPLETE_RANGES
#  endif

In
https://github.com/llvm/llvm-project/commit/b8cb1dc9ea87faa8e8e9ab7a31710a8c0bb8b084
this was removed, so it shipped in libc++ 16.0.0.

Unfortunately, if you install the llvm port, you only get the compiler, linker
etc, but the C++ library from the base system is still used, so on 13.2 that be
libc++ 15.0.

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