[libcxx-commits] [libcxx] [libc++] Fix P1206R7 feature test macros (PR #90914)

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krzysdz wrote:

@mordante Would it be possible to backport this to 18.x?
P1206R7 is supported since 17.0.0 (specifically 17bbb224f99cf6fde83aa68e2e22e70fe9ed77be). It would be nice to have `__cpp_lib_containers_ranges` in 18.x too.

https://github.com/llvm/llvm-project/pull/90914