We should not have examples that are specific to opengl on Windows.
In order to keep the use case's code in source, the example was moved to
tests/manual.
Pick-to: 6.5
Change-Id: Ie55aea777c449913e66279728c53f08c4105b66c
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Oliver Wolff