Statically link to GStreamer

[mtkennerly]

What's your idea?

This would make distribution simpler and ensure users have a consistent version/behavior. There is some ongoing work in the GStreamer project now to make this possible with the Rust bindings:

• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7624
• https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1495