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

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Follow-up Comment #3, sr #110266 (group autoconf):=0A=0AAlso see the test f=
ailures reported in sr #111381.=0A=0A=0A    _______________________________=
________________________=0A=0AReply to this item at:=0A=0A  <https://savann=
ah.gnu.org/support/?110266>=0A=0A__________________________________________=
_____=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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