gstreamer: Mark various enums as exhaustive

This reduces their size to 4 bytes instead of 5 bytes, and as such makes it possible to store them in a register on 32 bit platforms too. Additionally it makes it possible for enums like Result<FlowSuccess, FlowReturn> to be stored in a single register on 64 bit platforms.

Also the conversions between the C and Rust type is a simple copy of the value now instead of a mapping.

assigned to @gstreamer-merge-bot

mentioned in commit slomo/gstreamer-rs@d6bf3e1c

mentioned in commit slomo/gstreamer-rs@c33fb38c

mentioned in commit slomo/gstreamer-rs@2c2a6c38

added 3 commits

• d6bf3e1c - Update gir
• 2c2a6c38 - Regenerate with latest gir
• c33fb38c - gstreamer: Mark various enums as exhaustive

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merged