mshtml: suppress module unloading while gecko is loaded (take 2)

[Paul Vriens]

Dan Kegel wrote:
> Thanks to Mike Hearn for pointing out that mshtml reference
> counting was wrong, and Jacek for pointing out how to fix
> it for now.
> 
> Once gecko is loaded, don't let mshtml unload.
> This fixes a crash in starting Sketchup (bug 16164),
> and probably fixes a number of other apps that
> went pear-shaped after unloading mshtml...
> 
> 
> ------------------------------------------------------------------------
> 
> 
C++ style comment? Was this a Patchwatcher test ;)

-- 
Cheers,

Paul.