workaround executer-blocking-handling bug #2040
Merged
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this works around the executer-blocking-handling bug as described at async-rs/async-std#900
to make the android4.4 work again, only the flush() at create() is needed - however, create_and_copy() looks very similar to me, so i also added the flush() there. not sure if that is needed at other places as well.
closes #2032
closes deltachat/deltachat-android#1682