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Also update the C++20 status docs. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: * doc/xml/manual/status_cxx2020.xml: * doc/html/*: Regenerate. * include/bits/hashtable.h (__cpp_lib_generic_unordered_lookup): Define. * include/std/version (__cpp_lib_generic_unordered_lookup): Define. * testsuite/23_containers/unordered_map/operations/1.cc: Check feature test macro. * testsuite/23_containers/unordered_set/operations/1.cc: Likewise. (cherry picked from commit f78f25f43864f38ae5a6a9fcce8f26c94fe45bcd)