plugins-bad: Enable RIST plugin

This plugin has no external dependency and provide an implementation of RIST
simple profile protocol. RIST is derived from RTP, it provides a simple
receiver/transmitter elements that implement restransmission and more frequent
RTCP feedback, making it suitable for internet streaming.

Part-of: <gstreamer/cerbero!666>
15 jobs for enable-rist in 21 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build Docker
passed #6043234
alpine amd64 manifest builder docker

00:00:09

passed #6043233
android docker

00:00:13

passed #6043232
cerbero fedora amd64 docker

00:00:17

passed #6043231
fedora amd64 docker

00:00:17

passed #6043235
gst-indent amd64 docker

00:00:20

 
  Preparation
manual #6043236
manual
manifest
 
  Build
created #6043238
gstreamer
cerbero deps cross-android universal
created #6043242
gst-ios-13.2
cerbero deps cross-ios universal
created #6043239
gstreamer
cerbero deps cross-windows x86
created #6043240
gstreamer
cerbero deps cross-windows x86_64
created #6043237
gstreamer
cerbero deps fedora x86_64
created #6043241
gst-macos-10.15
cerbero deps macos x86_64
created #6043243
docker windows 1809 gstreamer-windows
cerbero deps msvc x86_64
 
  Integrate
created #6043244
cerbero cross-android universal examples
created #6043245
gst-ios-13.2
cerbero cross-ios universal examples