Make example work on Windows

Change-Id: I75a035939a390de8cdae03c11599efa0b7ed68df
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Rename v4 to qmljs

We don't want to officially support this binary in our release builds, so
give it a "safer" name and enable it only in developer builds.

Change-Id: Iaa007bc2ccdb133635161aae01d140efe0f44e23
Reviewed-by: Lars Knoll <lars.knoll@digia.com>