Adding support for both wine_gecko and Mozilla ActiveX.

[Andrew Riedi]

A lot of users would enjoy an option between installing wine_gecko and
Mozilla ActiveX.  Would it be very difficult to add a little dialogue box or
registry key to toggle between the two?  Is there a better way?  If it is
too difficult or will slow down work on eg. MSHTML and the like, don't worry
about it.  Anyhow, regardless of response, thanks for your work.  :)