Drop all GStreamer 0.10 support according to
ESC decision of 2019-06-06.

GStreamer 0.10 is obsolete and no longer needed,
superseded by GStreamer 1.0 which is available in
baseline (RHEL 7 or CentOS 7) and all relevant distros.

Change-Id: Ic317eba04d2c17e141acc983f37fbfa4301c9f3f
Reviewed-on: https://gerrit.libreoffice.org/73619
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>