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: <!666>
15 jobs for master in 80 minutes and 31 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed alpine amd64 manifest builder docker #6404627

00:00:13

passed android docker #6404626

00:00:16

passed cerbero fedora amd64 docker #6404625

00:00:20

passed fedora amd64 docker #6404624

00:00:17

passed gst-indent amd64 docker #6404628

00:00:16

 
  Preparation
passed manifest #6404629

00:00:21

 
  Build
passed cerbero deps cross-android universal #6404631
gstreamer

00:32:12

passed cerbero deps cross-ios universal #6404635
gst-ios-13.2

01:15:49

passed cerbero deps cross-windows x86 #6404632
gstreamer

00:18:45

passed cerbero deps cross-windows x86_64 #6404633
gstreamer

00:14:08

passed cerbero deps fedora x86_64 #6404630
gstreamer

00:12:04

passed cerbero deps macos x86_64 #6404634
gst-macos-10.15

00:51:46

passed cerbero deps msvc x86_64 #6404636
docker windows gstreamer-windows 1809

00:51:20

 
  Integrate
passed cerbero cross-android universal examples #6404637

00:06:42

passed cerbero cross-ios universal examples #6404638
gst-ios-13.2

00:03:59