Don't enable global hook if short paths are unavailable. Closes #2645
Don't enable global hook if short paths are unavailable. Closes #2645

* AppInit_DLLs requires short paths to be specified, if they can't be created on
  the volume we can't reliably enable the global hook.
* Detecting this programmatically is quite complex, but since we know the shim
  file is always longer than 8.3, if we detect that the short path is the same
  length as the long path we know short names weren't used.

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