gap/windows: add stubbed function for SetRandomAddress()

Signed-off-by: deadprogram <ron@hybridgroup.com>

Author: deadprogram

gap_windows.go

@@ -1,6 +1,7 @@
 package bluetooth
 
 import (
+	"errors"
 	"fmt"
 	"unsafe"
 
@@ -381,3 +382,8 @@ func (d Device) RequestConnectionParams(params ConnectionParams) error {
 	// BluetoothLEDevice.RequestPreferredConnectionParameters.
 	return nil
 }
+
+// SetRandomAddress sets the random address to be used for advertising.
+func (a *Adapter) SetRandomAddress(mac MAC) error {
+	return errors.ErrUnsupported
+}