hg: openjfx/11-dev/rt: 8215894: Provide media support for libav version 58

[johan at lodgon.com]

Changeset: 5d2ecc78f45c
Author:    almatvee
Date:      2019-04-22 13:20 -0700
URL:       https://hg.openjdk.java.net/openjfx/11-dev/rt/rev/5d2ecc78f45c

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