[quake3] Updated MSVC project files

[Erik Kloppenburg]

Julian Priestley wrote:
> I've updated the old ioquake3 MSVC project files (from revision 1160)
> to work with the latest revision, and raised bug 3390 for this change.
> I'm happy to maintain these project files if this is seen as an issue.

Hi, great initiative. It seems you did not add curl support, or did you? 
If you need help with that, I'd be happy to.