std: Refactor process exit code handling slightly

* Store the native representation directly in the `ExitStatus` structure instead
  of a "parsed version" (mostly for Unix).
* On Windows, be more robust against processes exiting with the status of 259.
  Unfortunately this exit code corresponds to `STILL_ACTIVE`, causing libstd to
  think the process was still alive, causing an infinite loop. Instead the loop
  is removed altogether and `WaitForSingleObject` is used to wait for the
  process to exit.

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