Nicolas Williams 37f10aaf85 cf: Restore AC_KRB_PROG_YACC to life ...

Using `AC_PROG_YACC` means accepting that `bison` gets invoked in yacc
compatibility mode (i.e., with the `-y` command-line option).  In recent
versions Bison has started to warn about use of Bison extensions when in
yacc compatibility mode -- even for things yacc itself accepts but which
it doesn't document.

I've confirmed that `bison -d` and `byacc -d` both work for the ASN.1
compiler.

2022-01-21 22:37:04 -06:00

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