Update package gstreamer from 1.20.1 to 1.22.0 (jsc#PED-3242)

- Add fix using sed to find gst-plugin-scanner-%{_target_cpu}
  program (boo#1207908).

- Add patch to reduce the required meson version to 0.61.0 since
  that's what we have in SLE 15:
  * reduce-required-meson.patch
- Probably because of a problem in SLE's meson, the generated
  pkgconfig files are missing some variables that are needed by
  rpm to generate the pkgconfig(...) provides correctly. In order
  to fix this, we now check for those variables and insert them
  in the pc files before installation if they're missing.

- Update to version 1.22.0:
  + AV1 video codec support improvements
  + New HLS, DASH and Microsoft Smooth Streaming adaptive streaming
    clients
  + Qt6 support for rendering video inside a QML scene
  + Minimal builds optimised for binary size, including only the
    individual elements needed
  + Playbin3, Decodebin3, UriDecodebin3, Parsebin enhancements and
    stabilisation
  + WebRTC simulcast support and support for Google Congestion
    Control
  + WebRTC-based media server ingestion/egress (WHIP/WHEP) support
  + New easy to use batteries-included WebRTC sender plugin
  + Easy RTP sender timestamp reconstruction for RTP and RTSP
  + ONVIF timed metadata support
  + New fragmented MP4 muxer and non-fragmented MP4 muxer
  + New plugins for Amazon AWS storage and audio transcription
    services

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