[PATCH] Fix build failure with macOS bison

[Simon Marchi]

On 2019-01-07 21:00, Tom Tromey wrote:
>>>>>> "Simon" == Simon Marchi <simon.marchi@ericsson.com> writes:
> 
> Simon> Since other files already use the name DOLLAR_VARIABLE, I
> suggest using it
> Simon> too.  I went a bit further and changed other .y files too, so 
> they use a
> Simon> consistent name.
> 
> Simon> Tom, are you ok with this?
> 
> Yes, completely.  Thanks for doing this.

Pushed, thanks.

Simon