It's in GSTREAMER_1_0_LIBS on Fedora 30.

Change-Id: I0a9e5a53ee1bbd4ac4109ccbdbbd94b909b62118
Reviewed-on: https://gerrit.libreoffice.org/72174
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>