aio: windows: fix initialization error in ovlOff #9
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This PR fixes a segfault that occurred on Windows when attempting to run the
aio_dynamic.zigandaio_immediate.zigexamples. This segafault was occurring because of a failure to initialize the OVERLAPPED structs associated with the I/O operations. According to the Windows documentation this struct needs to be zero initialized before it is used in any API calls. This PR simply changes the initialization functionovlOffto properly zero initialize the structs.