Change poll's timeout from c_int to Option<&Timespec>.
#1285
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This harmonizes the timeout with the rest of rustix, which uses `Timespec` for all time values. And, it eliminates the awkwardness of using `-1` as a sentinel value. On platforms with `ppoll`, the `Timespec` can be passed straight to the OS. On platforms without `ppoll`, we have to do a fallible conversion into `c_int`.
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This harmonizes the timeout with the rest of rustix, which uses
Timespecfor all time values. And, it eliminates the awkwardness of using-1as a sentinel value.On platforms with
ppoll, theTimespeccan be passed straight to the OS. On platforms withoutppoll, we have to do a fallible conversion intoc_int.