Bison is a well known external dependency, so just require it. Including the generated content in git means it may or may not be regenerated based randomly on timestamps, etc. Also use `$(AM_V_GEN)` so we get prettier output.
Bison is a well known external dependency, so just require it. Including the generated content in git means it may or may not be regenerated based randomly on timestamps, etc. Also use `$(AM_V_GEN)` so we get prettier output.