plugins/rl: fix warnings-as-errors build for Rocket League plugin.
plugins/rl: fix warnings-as-errors build for Rocket League plugin.

SuperNascher/mumble,SuperNascher/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,LuAPi/mumble,SuperNascher/mumble,Lartza/mumble,Lartza/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Lartza/mumble,Lartza/mumble,LuAPi/mumble,LuAPi/mumble,Lartza/mumble,LuAPi/mumble,LuAPi/mumble,SuperNascher/mumble,LuAPi/mumble,SuperNascher/mumble,Lartza/mumble,LuAPi/mumble,SuperNascher/mumble,SuperNascher/mumble