gnu: gst-plugins-bad: Add support for Secure Reliable Transport (SRT).

* gnu/packages/gstreamer.scm (gst-plugins-bad)[inputs]: Add srt-1.4.1.

gnu/packages/gstreamer.scm

@@ -723,6 +723,8 @@ (define-public gst-plugins-bad
        ;("qtdeclarative" ,qtdeclarative)
        ;("qtx11extras" ,qtx11extras)
        ("soundtouch" ,soundtouch)
+       ;; GStreamer is not yet compatible with srt > 1.4.1.
+       ("srt" ,srt-1.4.1)
        ("x265" ,x265)
        ("wayland" ,wayland)))
     (home-page "https://gstreamer.freedesktop.org/")