Implement LWG-3887 Version macro for allocate_at_least
#3589
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The change has been adoped into the C++ Working Draft by commit cplusplus/draft@6e7fd98. However, it isn't contained in WG21-N4944. A newer WD (and perhaps the published C++23 Standard?) will contain it.
Driven-by change: concept dependency of
allocator_at_least
was removed by #3542, so the feature-test macro should also be enabled even if the concept support is absent.