Add stub

dns/override/dns_override_ios.go

@@ -0,0 +1,17 @@
+//go:build ios
+
+package olm
+
+import (
+	"github.com/fosrl/olm/dns"
+)
+
+// SetupDNSOverride is a no-op on iOS as DNS configuration is handled by the system
+func SetupDNSOverride(interfaceName string, dnsProxy *dns.DNSProxy) error {
+	return nil
+}
+
+// RestoreDNSOverride is a no-op on iOS as DNS configuration is handled by the system
+func RestoreDNSOverride() error {
+	return nil
+}