Re: [PATCH] Make test-mhical pass with BSD yacc.

I didn't push this one directly because it may be a tad
controversial.  This test was added in:

commit 7eecb2dcc4a30573ee644491a04e18d1acd7ec81
Author: David Levine <levinedl@acm.org>
Date:   Sun Jul 16 09:02:08 2017 -0400

    Enhanced mhical syntax error message to provide some context.

    Specifically for the case of improperly folded lines.

I'm guessing the error format enshrined in the test is that
of Bison :)

Let me know if y'all think it's ok to push.

Thanks!