Time to remove obsolete platforms HP, SGI, and DEC?

[Juan Lang]

> The only use of these platforms was three mistaken
> bug reports that probably wanted PC.  I don't see
> any reason to keep these old system types around
> any more.
> OK to remove?
> (Suggested in http://bugs.winehq.org/show_bug.cgi?id=13363 )

Please.
--Juan