John Baldwin d32324f64f Clean up some of the pts(4) vs pty(4) stuff in grantpt(3) and friends:
- Use PTY* for all pty(4) related constants.
- Use PTMX* for all pts(4) related constants.
- Consistently use _PATH_DEV PTMX rather than "/dev/ptmx".
- Revert 1.7 and properly fix it by using the correct prefix string for
  pts(4) masters.

MFC after:	3 days
2007-12-21 21:26:08 +00:00
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