[libc++][NFC] Use _LIBCPP_STD_VER instead of __cpp_lib_atomic_is_always_lock_free
Reviewed By: #libc, ldionne, Mordante Spies: Mordante, libcxx-commits Differential Revision: https://reviews.llvm.org/D150421
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Reviewed By: #libc, ldionne, Mordante Spies: Mordante, libcxx-commits Differential Revision: https://reviews.llvm.org/D150421