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vulkan/overlay: Add a workaround semaphore for application presenting without one

Lionel Landwerlin requested to merge llandwerlin/mesa:review/overlay-workaround-present-semaphore into master

When an application calls vkQueuePresent() on a different queue than the one we run out drawing on and it doesn't give a semaphore to wait one, let's insert our own so that we don't race the application's drawing.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Closes: #2540 (closed)

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