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The primary issue is that `mem::transmute` from `isize` to `Box<_>` (without first casting to `*mut _`) is undefined behavior. On Rust v1.78.0+, this ends up crashing with `STATUS_ILLEGAL_INSTRUCTION` when `ReadDirectoryChangesW` fails and this branch is hit in release mode. While this could be fixed by simply adding `as *mut ReadDirectoryRequest`, this cleans up the overall unsafe logic to be more readable and idiomatic Rust.
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Rebased version of #602 to fix up the old unsafe code for the windows API.
Also fixes the freeBSD pipeline.
Closes #602