Bump gtk-vnc dependency

[Jonh Wendell <jwendell gnome org>]

Hi, folks.

Can I update vinagre dependency on gtk-vnc to 0.3.7, which was released
today[1]?

This release fixes two vinagre bugs:

- Support for scaling down[2]: I have a patch prepared for Vinagre since
June, it's just waiting this gtk-vnc release.
- Black Screen connection to an UltraVNC server[3]

I'd really like to release Vinagre 2.24 with those 2 bugs fixed.

[1]-http://sourceforge.net/project/shownotes.php?group_id=190580&release_id=624323
[2]-http://bugzilla.gnome.org/show_bug.cgi?id=533282
[3]-http://bugzilla.gnome.org/show_bug.cgi?id=531933

Thanks,
-- 
Jonh Wendell
http://www.bani.com.br