Delete minimum GStremer required version for some plugins
Tested building the pluging with cargo-c and running gst-inspect-1.0 in a Ubuntu Xenial 18.04 LTS. It contains GStreamer 1.8.3.
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Tested building the pluging with cargo-c and running gst-inspect-1.0 in a Ubuntu Xenial 18.04 LTS. It contains GStreamer 1.8.3.