WireGuard kernelTun: Check Capabilities instead of checking UID (#3871)

https://github.com/XTLS/Xray-core/pull/3871#issuecomment-2412820323

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Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>

proxy/wireguard/tun_default.go

@@ -11,6 +11,6 @@ func createKernelTun(localAddresses []netip.Addr, mtu int, handler promiscuousMo
 	return nil, errors.New("not implemented")
 }
 
-func KernelTunSupported() bool {
-	return false
+func KernelTunSupported() (bool, error) {
+	return false, nil
 }