Add some debug warnings to the GL paint engine regarding stencil

There is absolutely nothing we can do if the render target has no
stencil buffer, but print at least a warning in debug builds to give a
hint to the developer.

Task-number: QTBUG-96786
Change-Id: If7f84f28f9bc9b3dadd01d0816c8db4015a1db0b
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit e5d65996a93bbf4cbc8a155887def6efa3ad73de)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions