Whilst Sato still uses GTK+ 2 we don't want the overhead of building both GTK+ 2
and GKT+ 3. Luckily gtk-play is a simple application and it's just a small
patch away from building with GTK+ 2.
When Sato is ported to GTK+ 3 (the mythical Shuku proposal) this patch can be
removed.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>