gst-ptp-helper: Do not disable multicast loopback

Otherwise we cannot run gst-ptp-helper if the PTP master is on the
same device.

Part-of: <gstreamer/gstreamer!1306>
28 jobs for !1306 with enable-multicast-loopback-ptp-helper in 74 minutes and 32 seconds (queued for 9 seconds)
detached
Status Name Job ID Coverage
  Trigger
passed trigger #15559668

00:00:05

 
  Build Docker
passed fedora amd64 docker #15559669

00:02:56

passed gst-indent amd64 docker #15559670

00:01:24

passed windows amd64 docker #15570924
windows shell 1809

00:00:09

failed windows amd64 docker #15561963
windows shell 1809

00:00:08

failed windows amd64 docker #15559671
windows shell 1809

00:02:23

 
  Preparation
passed gst indent #15559672

00:00:32

 
  Build
passed build clang fedora x86_64 #15559674

00:06:17

passed build documentation #15559680

00:07:07

manual build msys2 #15559677
docker windows 1809 allowed to fail manual
passed build nodebug fedora x86_64 #15559673

00:07:34

passed build vs2017 amd64 #15559675
docker windows 1809

00:09:18

passed build vs2017 x86 #15559676
docker windows 1809

00:07:44

passed cerbero trigger #15570925

00:31:03

passed gstreamer-full-minimal static build #15559679

00:04:59

passed gstreamer-full static build #15559678

00:06:44

failed cerbero trigger #15559681

00:41:10

 
  Test
passed check fedora #15559682
gstreamer

00:09:04

passed integration testsuites fedora 1/4 #15559683
gstreamer

00:33:37

passed integration testsuites fedora 2/4 #15559684
gstreamer

00:34:25

passed integration testsuites fedora 3/4 #15559685
gstreamer

00:37:50

passed integration testsuites fedora 4/4 #15559686
gstreamer

00:35:20

passed valgrind bad #15559691
gstreamer

00:16:17

passed valgrind base #15559688
gstreamer

00:14:30

passed valgrind core #15559687
gstreamer

00:13:59

passed valgrind ges #15559692
gstreamer

00:08:04

passed valgrind good #15559689
gstreamer

00:15:21

passed valgrind ugly #15559690
gstreamer

00:06:33