gstreamer: Add common .inc files for meson based recipes
* gstreamer1.0-plugins-common.inc
The old gstreamer1.0-plugins.inc file, adapted for meson
* gstreamer1.0-plugins-packaging.inc
The old gst-plugins-package.inc file, adapted for meson
* gstreamer1.0-ptest.inc
Common code for meson based PTest support; autogenerates the run-ptest
file and is designed to use the gnome-desktop-testing suite runner
(which is why the .inc files inherits from ptest-gnome)
Signed-off-by: Carlos Rafael Giani <crg7475@mailbox.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
