Fix broken wince builds

The qmake guards were completely wrong. The wince code was removed
from the source base but qmake was never told to exclude wince from
the build.

Change-Id: I5627d321a64669f642749d353e6c0b51704f1dcc
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>