hg: openjfx/jfx-dev/rt: 8215894: Provide media support for libav version 58

[alexander.matveev at oracle.com]

Changeset: b854a3a2d17d
Author:    almatvee
Date:      2019-04-22 13:20 -0700
URL:       http://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/b854a3a2d17d

8215894: Provide media support for libav version 58
Reviewed-by: kcr, jvos

! build.gradle
! modules/javafx.media/src/main/native/gstreamer/gstreamer-lite/gstreamer/gst/gstregistry.c