bug#6207: 23.1; align.el vhdl rules setup

Kevin Ryde wrote:
> Reto Zimmermann <reto <at> gnu.org> writes:
>> So the settings in align.el are obsolete and could be removed.
> 
> The mechanisms in align.el seem a bit more general.
> Should vhdl be using it perhaps with updates to the rules list?

The alignment code in vhdl-mode is customized and fine-tuned for VHDL in a a way that I think cannot be
implemented with the more general align.el.