gstwebrtc-api: Patch webrtc-adapter to fix Safari behaviour

Workaround, fixes #439 (closed)

Uses patch-package to remove the check that current Safari versions fail, causing the empty-candidate scenario to not work anymore. As far as I see, this shouldn't have any bad side effects, might just apply the shim on some versions that don't necessairly need it.

Should be removed as soon as https://github.com/webrtcHacks/adapter/issues/1140 is resolved.