Change syncqt default parameters for shadow building

Change syncqt default parameters for shadow building

For shadow builds configure creates syncqt script to shadow build
directory tree calling the original syncqt from qtbase source tree.
This wrapped script will add two default parameters when calling
the original script. Both parameters are overridden in
qtbase/mkspecs/features/default_pre.prf and are not needed except by
configure script itself in latter stages where the parameter should be
applied explicitly in shadow build condition branch.

In addition, it adds the qtdir parameter for the forwarded syncqt call to
indicate the location of qt sources for the syncqt. This also will give
correct qmake path for qtmodule-configtests script triggered from syncqt.

Changes are done both for Linux and Windows configure.

Change-Id: I307b2e76c203ee14b849f10ff629f9668da2f223
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>