Some new algorithms need to use _GLIBCXX_STD_A to refer to the "normal"
version of the algorithm, to workaround the namespace dance done for
parallel mode.
PR libstdc++/94971 (partial)
* include/bits/ranges_algo.h (ranges::__sample_fn): Qualify
std::sample using macro to work in parallel mode.
(__sort_fn): Likewise for std::sort.
(ranges::__nth_element_fn): Likewise for std::nth_element.
* include/bits/stl_algobase.h (lexicographical_compare_three_way):
Likewise for std::__min_cmp.
* include/parallel/algobase.h (lexicographical_compare_three_way):
Add to namespace std::__parallel.
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