Added the Linux and Darwin stubs for the winutils package

This means that the livedata bit of the code is only available on
windows

winutils/winutils_linux.go

@@ -0,0 +1,53 @@
+//go:build (linux && cgo) || (darwin && cgo)
+// +build linux,cgo darwin,cgo
+
+package winutils
+
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
+const (
+	WAIT_OBJECT_0 = 0
+	WAIT_TIMEOUT  = 258
+)
+
+var (
+	once             sync.Once
+	ErrUnsupportedOS = errors.New("not found")
+)
+
+type utils struct {
+}
+
+// INITIALIZATION
+func newUtils() (*utils, error) {
+	return nil, ErrUnsupportedOS
+}
+
+func (u *utils) Close() {
+}
+
+// openEvent opens a windows.Handle for a given event
+func (u *utils) OpenEvent(eventName string) error {
+	return ErrUnsupportedOS
+}
+
+// OpenBroadcastChannel opens up a broadcast channel to send commands to iracing
+func (u *utils) OpenBroadcastChannel(name string) error {
+	return ErrUnsupportedOS
+}
+
+// INITIALIZATION
+
+// openEvent waits for a good response for some given time
+func (u *utils) CheckValidDataEvent(timeout time.Duration) bool {
+	return false
+}
+
+// SendBroadcastMessage sends a message trough the broadcast channel
+func (u *utils) SendBroadcastMessage(id, p1, p2 uintptr) error {
+  return ErrUnsupportedOS
+}