Several long-awaited updates for the Macintosh port, by Dean
Luick and myself. This set affects Mac-only files.
* Update the support for MPW compilers.
* Use new system call names provided for in the latest Apple
Universal Headers.
* Tune up some of the includes for CodeWarrior.
* Define YY_NEVER_INTERACTIVE for the dungeon and level compilers.
* Remove pointless debugging code.
* Clean up some unterminated comments.