[cairo] pixman configure checks for gtk+

[Soeren Sandmann]

Richard Hult <richard at imendio.com> writes:

> Behdad Esfahbod wrote:
> > Hi Soeren,
> > Seems like pixman looks for Gtk+ during configure, to enable some
> > interactive tests.  This can make life hard for people trying to build
> > an entire GNOME stack in an alternative prefix.
> > I suggest at least a --disable-gtk option be added to pixman's
> > configure.
> 
> I'm running into this problem as well, attaching a patch that adds the
> suggestion option.

Thanks, pushed.

Soren