gmtk: add dependency on gtk+3 and pulseaudio

* fixes following floating dependencies:
  gmtk/gmtk/latest lost dependency on  cairo-gobject dbus-lib gtk+3
    json-c libcap libice libpulse libpulse-mainloop-glib libsm libsndfile1
    libx11-xcb libxi libxtst util-linux-libuuid

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>