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

Update of sr #110266 (project autoconf):

                Priority:              5 - Normal => 1 - Later              

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Follow-up Comment #2:

Yeah, I think AC_PROG_BISON would be 2.71 material at this point.  Considering
the course of the other bug, an AC_PROG_FLEX might be a good idea too (but
again, 2.71 material).

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