Remove the warning message that was introduced in 84f2792597.
It is triggered for debug_and_release projects that are built against
a single-configuration Qt. Silently fall back to the behavior before
84f2792597 like it always was the case.
Change-Id: I67ed1a145ec5d7a4047b0ce5ad43bf0fc6834d60
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>