Log messages are lost

The logging in MakeWixForDirTree just puts out "High", "Normal" and "Low". The actual message is lost. Makes for pretty useless logging. See an example [here](https://build.palaso.org/viewLog.html?tab=buildLog&buildTypeId=Transcelerator_TransceleratorWinPublish64bit&buildId=318561&_focus=11504#_state=3949,3955,11549,11551,11553,11496,11500).