[patch #9150] AX_CXX_COMPILE_STDCXX: Add checks for C++17

Update of patch #9150 (project autoconf-archive):

                  Status:                    None => Done                   
             Assigned to:                    None => simons                 

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Follow-up Comment #2:

I believe those patches are now obsolete, i.e. have been applied already in
another ticket?

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