packages: Update libs/pixman from 0.28.2 to 0.30.2.

Change-Id: If793a2304b6b116d4355384b9d7e60feba42cd79
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/662
Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>
platforms/avionic-design: Update subproject.

Change-Id: Ica87b6e9b79dcc96151093e7437f450f4ee3d641
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/692
Reviewed-by: Dirk Leber <dirk.leber@avionic-design.de>