package/weston: add patch to support pipewire 0.3 API

This is required when building weston against the latest pipewire
release.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>