[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] fix event memory leak (#373)

[maenu]

I used `@autoreleasepool` because it is used elsewhere: https://github.com/OpenSmalltalk/opensmalltalk-vm/search?q=autoreleasepool&unscoped_q=autoreleasepool

Having said that, I have virtually no experience with Objective-C and on the coding conventions for the VM, so expert opinions are highly appreciated. Also, we need to make sure that the solution does not have unwanted side-effects. If I am understanding the code correctly, we only have to make sure that `alienEventQueue` is eventually released.

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