The dll versions with a "d" before the "4" are debug versions.  Release builds should include the dll files w/out the "d".  eg. "QtGui4" vs "QtGuid4".  What's why the original had separate copy_file_list sections for the 2 builds.   See [starting here](https://github.com/AutoQuad/qgroundcontrol/blob/master/qgroundcontrol.pri#L353) for one way to handle it.