Makefiles: Add a default BISONFLAGS variable for widl, wmc, wrc and wpp.

[Alexandre Julliard]

Robert Shearman <rob at codeweavers.com> writes:

> They all allow debugging to be turned on by the user and this doesn't
> work without passing the "-t" flag to BISON.

They have debug options, but I don't think debugging them is useful at
this point. For widl yes, but the others are stable and don't see any
more development, so there's no need to always compile in a lot of
useless debugging code.

-- 
Alexandre Julliard
julliard at winehq.org