WireGuardApp: Add back the wireguard-go version extraction script and use WIREGUARD_GO_VERSION directly

Avoids linking against libwg-go.a in order to access the WireGuard backend version.

Signed-off-by: Andrej Mihajlov <and@mullvad.net>

Sources/Shared/Logging/Logger.swift

@@ -49,7 +49,7 @@ public class Logger {
         if let appBuild = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
             appVersion += " (\(appBuild))"
         }
-        Logger.global?.log(message: "App version: \(appVersion); Go backend version: \(wireGuardVersion)")
+        Logger.global?.log(message: "App version: \(appVersion); Go backend version: \(WIREGUARD_GO_VERSION)")
     }
 }