upstream: retain the original event mask when injecting the wakeup event to prevent the subsequent `_mk_event_del` call from trying to delete the wrong type of event from the underlying event loop.
upstream: retain the original event mask when injecting the wakeup
event to prevent the subsequent `_mk_event_del` call from trying to
delete the wrong type of event from the underlying event loop.

Signed-off-by: Leonardo Alminana <7610bae85f2b530654cc716772f1fe653373e892@calyptia.com>

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