bison warning fixes

DJ Delorie
Tue Oct 18 16:13:00 GMT 2016

Nick Clifton <> writes:
> Since building rx-parse.c is not conditional upon maintainer-mode being enabled
> we cannot conditionalize a test of the bison version in use.  (Maybe we should
> change this and make the rx-parse.c build rule conditional on maintainer mode
> and then we could add a version test).

I think moving that to maintainer mode makes sense.  We could then
require the right bison version when maintainer mode is enabled, and not

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