Follow-up to d13bedb9d8
where the regexp was a bit too tight and missed many specs.
Also cleaned up QMAKE_IDC, QMAKE_RCC and QMAKE_IDL.
Change-Id: Ia15007141739019ef5ccfdda0c856c478f732b85
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>