In some versions of Microsoft Windows SDK v6.0A, the qedit.h header is
present, but dxtrans.h (which is #included by qedit.h) is missing.

The standard workaround for this issue is already used by
plugins/multimedia/directshow/camera/dscamerasession.h; this commit adds
the same workaround to the config test.

Reviewed-by: Michael Goddard
Reviewed-by: Ling Hu
(cherry picked from commit e3c07dc9dd6a9f7930ca3c61cfd667d816731ce1)

Change-Id: Ia53c4f6b3efc86e2447a39e6d95e7f67d7e46b5d
Reviewed-on: http://codereview.qt-project.org/5498


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>