CI: add the rest of the gst deps.

3 jobs for master in 18 minutes and 44 seconds (queued for 1 minute and 22 seconds)
Status Job ID Name Coverage
  Test
passed #54151
flatpak

00:17:45

 
  Deploy
failed #54179
pages

00:00:58

failed #54152
pages

00:00:58

 
Name Stage Failure
failed
pages Deploy
Fedora 28 - x86_64                               37 MB/s |  60 MB     00:01    
Last metadata expiration check: 0:00:06 ago on Wed Jun 27 08:06:04 2018.
No match for argument: gstreamer1-devel
No match for argument: gstreamer1-plugins-base-devel
No match for argument: gstreamer1-plugins-good
No match for argument: gstreamer1-plugins-bad-free
No match for argument: gstreamer1-plugins-bad-free-extras
Error: Unable to find a match
ERROR: Job failed: exit code 1