[Rust] types of SetProcessWorkingSetSize's parameters should be isize, instead of usizfe

[csmoe]

See https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-setprocessworkingsetsize the parameters can be -1

If both dwMinimumWorkingSetSize and dwMaximumWorkingSetSize have the value (SIZE_T)–1, the function removes as many pages as possible from the working set of the specified process.

microsoft/windows-rs#3281

[riverar]

SIZE_T is a ULONG_PTR, emphasis on unsigned, so is not likely to get changed here. Just an unfortunate API design. But will leave this open if folks want to do something to improve the situation here.

[csmoe]

For others encountering this, here's a workaround: pass usize::MAX to this function.