gdk-pixbuf-native: add setscene dep on jpeg-native

Without this, we can get setscene postinst failure due to libjpeg being
unavailable.

Signed-off-by: Christopher Larson <kergoth@gmail.com>
Merge pull request #130 from kergoth/gdk-pixbuf-native-setscene-failure-fix

gdk-pixbuf-native: add setscene dep on jpeg-native