hedgewars-engine (rust): fix "protocol_version" -> "hedgewars_engine_protocol_version"
That function/symbol was renamed in ef2fc0210362
use crate::{MessageChecker, Severity};
struct URLChecker {}
impl<T> MessageChecker<T> for URLChecker {
fn check(&self, player_id: T, message: &str) -> Severity {
Severity::Pass
}
}