[FFe] Update gtk-vnc to 0.3.4

I'd like to request permission to update gtk-vnc to the newly released 0.3.4 version.

From the release announcement:
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Bug fixes:

 o Fix cursor visibility when in relative pointer mode (Anthony Liguori)
 o Fix vnc_auth_credential signal marshalling (Anthony Liguori, Saori Fukuta)
 o Add missing break in key event handling (Marton Balint)
 o Various build cleanups (Atsushi SAKAI)
 o Fix key event tracking (Daniel Berrange)
 o Fix big endian color conversion (Hiroyuki Kaguchi)
 o More debug messages (Jonh Wendell)
 o Add interface to explicitly force pointer grab (Anthony Liguori)
 o Always emit signals from system coroutine (Anthony Liguori)
 o Revert to 0.3.3 set_pointer_grab behavior (Anthony Liguori)
 o spec file updates and configure support for Fedora 9 (Dan Berrange)

New features:

 o Focus widget on mouse click (Jonh Wendell)
 o WMVi support (Stefano Stabellini)
 o OpenGL based scaling (Anthony Liguori, Daniel Berrange)
 o VNC scancode extension (Anthony Liguori)
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As you can see, there are quite a few important bug fixes (I actually consider the "Focus widget on mouse click" feature a bugfix, but that might just be me).
Additionally, the "VNC scancode extension" feature has been in Ubuntu for months as a separate patch. This is now an officially blessed VNC extension.