Macintosh port update

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.

sys/mac/macsnd.c

@@ -55,9 +55,8 @@ mac_speaker (struct obj *instr, char *melody) {
 	/*
 	 * Set up the synth
 	 */
-	if (itworked (SndNewChannel (&theChannel, sampledSynth, initMono +
-		initNoInterp, (void *) 0))) {
-
+	if (SndNewChannel(&theChannel, sampledSynth, initMono +
+		initNoInterp, (void *) 0) == noErr) {
 		char midi_note [] = {57, 59, 60, 62, 64, 65, 67};
 
 		short err;
@@ -89,8 +88,6 @@ mac_speaker (struct obj *instr, char *melody) {
 		}
 		SndDisposeChannel (theChannel, false);	/* Sync wait for completion */
 		ReleaseResource (theSound);
-
-		mustwork (err);
 	}
 }