vendor: Revert to github.com/jackpal/gateway instead of fork

It now includes all the fixes

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3246

vendor/github.com/jackpal/gateway/gateway_unimplemented.go

@@ -0,0 +1,14 @@
+// +build !darwin,!linux,!windows,!solaris,!freebsd
+
+package gateway
+
+import (
+	"fmt"
+	"net"
+	"runtime"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	err = fmt.Errorf("DiscoverGateway not implemented for OS %s", runtime.GOOS)
+	return
+}