remove some vestiges of QFontEngineQPF

amends d7e424ee66.

Change-Id: I9aaef14f8ecba78685ce5f7e908a0b42e554434f
Reviewed-by: thiago
Reviewed-by: paulot
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Add QMAKE_PKGCONFIG_VERSION variable to allow version overriding

Change-Id: Ibba50c74f308d81e0058e4dacec7ed84e738473e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>