Do not loop over close() for EINTR
Do not loop over close() for EINTR

Such a loop is not allowed on Linux.  It might be mandatory on e.g HP-UX,
but to handle that we need to make the close behaviour OS dependent
based on a configure test, and need to figure out when we are allowed
to do such an EINTR loop e.g from a scheduler thread, and must we
regard all closing as potentially blocking and defer to a dirty I/O NIF?

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