[sr #110266] Revert regression in Yacc support, and add Bison support

Update of sr #110266 (project autoconf):

                  Status:                    None => In Progress            

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Follow-up Comment #1:

Thanks for reporting this. I started the ball rolling on it by reverting the
mistaken patch in question. This should be enough for a 2.70 release, though
it'd be good to add an AC_PROG_BISON too.

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