rtpjitterbuffer: Drop packets with sequence numbers before the seqnum-base
rtpjitterbuffer: Drop packets with sequence numbers before the seqnum-base

These are outside the expected range of sequence numbers and should be
clipped, especially for RTSP they might belong to packets from before a seek
or a previous stream in general.

stfl/gst-plugins-good,vatavuserban/gst-plugins-good,loshca/gst-plugins-good,stfl/gst-plugins-good,hizukiayaka/gst-plugins-good,froggatt/gst-plugins-good-m,BigBrother-International/gst-plugins-good,GrokImageCompression/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,hizukiayaka/gst-plugins-good,chamois94/gst-plugins-good,pexip/gst-plugins-good,sebras/gst-plugins-good,rawoul/gst-plugins-good,loshca/gst-plugins-good,chamois94/gst-plugins-good,freedesktop-unofficial-mirror/gstreamer__gst-plugins-good,sh0/gst-plugins-good,hizukiayaka/gst-plugins-good,Kurento/gst-plugins-good,kittee/gst-plugins-good,pexip/gst-plugins-good,froggatt/gst-plugins-good-m,froggatt/gst-plugins-good-m,StreamUtils/gst-plugins-good,vatavuserban/gst-plugins-good,GrokImageCompression/gst-plugins-good,freedesktop-unofficial-mirror/gstreamer__gst-plugins-good,Kurento/gst-plugins-good,veo-labs/gst-plugins-good,sh0/gst-plugins-good,ijsf/OpenWebRTC-gst-plugins-good,rawoul/gst-plugins-good,freedesktop-unofficial-mirror/gstreamer__gst-plugins-good,kittee/gst-plugins-good,GStreamer/gst-plugins-good,sh0/gst-plugins-good,ijsf/OpenWebRTC-gst-plugins-good,veo-labs/gst-plugins-good,StreamUtils/gst-plugins-good,rawoul/gst-plugins-good,GStreamer/gst-plugins-good,ijsf/OpenWebRTC-gst-plugins-good,Kurento/gst-plugins-good,Kurento/gst-plugins-good,StreamUtils/gst-plugins-good,chamois94/gst-plugins-good,veo-labs/gst-plugins-good,StreamUtils/gst-plugins-good,GrokImageCompression/gst-plugins-good,ijsf/OpenWebRTC-gst-plugins-good,vatavuserban/gst-plugins-good,BigBrother-International/gst-plugins-good,BigBrother-International/gst-plugins-good,sebras/gst-plugins-good,shelsonjava/gst-plugins-good,shelsonjava/gst-plugins-good,loshca/gst-plugins-good,ikonst/gst-plugins-good,shelsonjava/gst-plugins-good,kittee/gst-plugins-good,sebras/gst-plugins-good,pexip/gst-plugins-good,vatavuserban/gst-plugins-good,veo-labs/gst-plugins-good,kittee/gst-plugins-good,ikonst/gst-plugins-good,stfl/gst-plugins-good,stfl/gst-plugins-good,BigBrother-International/gst-plugins-good,sh0/gst-plugins-good,hizukiayaka/gst-plugins-good,loshca/gst-plugins-good,froggatt/gst-plugins-good-m,chamois94/gst-plugins-good,sebras/gst-plugins-good,freedesktop-unofficial-mirror/gstreamer__gst-plugins-good,ikonst/gst-plugins-good,GStreamer/gst-plugins-good,Kurento/gst-plugins-good,shelsonjava/gst-plugins-good,rawoul/gst-plugins-good,GrokImageCompression/gst-plugins-good,ikonst/gst-plugins-good,GStreamer/gst-plugins-good