In release configs qmake sets DebugInformationFormat to None.
If ProgramDataBaseFileName is left unset, then VS 2012 will always
rebuild the complete project. Therefore, qmake now inserts an empty
ProgramDataBaseFileName tag if DebugInformationFormat is None.
Task-number: QTBUG-35570
Change-Id: Ifb91b0bbcf6614621bfe3b12429e2624bd16e77a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>