[patch #8608] m4_ax_cxx_compile_stdcxx_11.m4 fails for clang with [-Werror, -Wunused-variable]

Update of patch #8608 (project autoconf-archive):

                  Status:                    None => In Progress            
             Assigned to:                    None => simons                 

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Follow-up Comment #1:

I'm adding the macro authors to Cc to solicit comments.

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