configure.exe: move a few things from qmodule.pri to qconfig.pri

configure.exe: move a few things from qmodule.pri to qconfig.pri

QMAKE_RPATHDIR, QT_LIBINFIX and QT_NAMESPACE were previously set in
qmodule.pri on Windows, and qconfig.pri on platforms other than Windows.
Make the behavior consistent, move them to qconfig.pri.

qconfig.pri is the correct file because these variables need to be
visible for _all_ users of Qt, and not only the other Qt modules (the
ones who load qmodule.pri).

Change-Id: I4d517488a80b134a78ebde8d3196bdab3c3ab991
Reviewed-by: Lincoln Ramsay <lincoln.ramsay@nokia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>