this is an exclusively user-controllable variable. the mkspec may provide
a default via QT_QPA_DEFAULT_PLATFORM when it deviates from the platform
default known to configure, and these specs actually already make use of
that.
Change-Id: I7531063d4c404ebed7b2cc1647c61626db30daef
Reviewed-by: Kyle Edwards <kyle.edwards@kitware.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
... to the new qmake based configuration system.
This removes the old qfeatures.txt (distributed over configure.json
files) and qfeatures.h (distributed over qconfig-<module>.h files).
qfeatures.prf is gone without replacement, as attempts to use it would
lead to followup errors anyway.
Change-Id: I1598de19db937082283a905b9592d3849d2199d0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>