In sight of upcoming update, overhaul things slightly:

- NVVERSION is no longer user settable.  nVidia changed their versioning
  scheme, which made my life a bit harder.  Since this is master port and
  cares about legacy version slaves as well, derive NVVERSION from DIST-
  VERSION as doing so required less intrusive changes.  Update the comment
  accordingly.  UPDATING note will be committed separately
- Retire OSVERSION hack since it's no longer needed.  PORTREVISION are now
  set in all three nvidia-driver ports independently.  Previously it was
  not really safe because NVVERSION was user settable variable
- Introduce new variable, SHLIB_VERSION, and use it in PLIST_SUB, because
  it's not always equal to NVVERSION these days
- Mute MKDIR along the way

For slave ports:

- Rename port directory names to reflect future reality: their versions
  going to bump as well.  No repo copy since there's no history to preserve

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