All Qt applications crash on startup on macOS 10.13 with an
infinite recursion in -[QNSWindow sendEvent:].
This reverts commit a980250a66.
Change-Id: I155a89e61b1695f18627bf158389eb130b98751a
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>