gstreamer: Import 1.2.2 from oe-core

* taken from oe-core 8163854adf87ac42a8f08ee25685d0ce1efb4724
  only change is to reuse .inc files from oe-core/dora where they were
  the same or only DESCRIPTION/SUMMARY was different

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