take initial stab at macsound interface

Use macOS AppKit framework routines for a first cut at a
macsound soundlib interface.

Requires WANT_MACSOUND=1 on build.

Nothing has been done to move the stock sounds into the resources
of a bundle, so after building, if you want to try the stock sounds
out:
	cp sound/wav/*.wav ~/Library/Sounds

Because the NSSound macOS routines always do the search, supposedly
the following locations are searched in this order:
   1. the application’s main bundle
   2. ~/Library/Sounds
   3. /Library/Sounds
   4. /Network/Library/Sounds
   5. /System/Library/Sounds

Although not specifically implemented as of yet, it may be pretty
close to being able to put soundeffects wav files (by se_ name)
into ~/Library/Sounds working for the SND_SOUNDEFFECTS_AUTOMAP feature.

Feedback is welcome. Contributions for improving it are even more
welcome.

The new soundlib supporting file is named
sound/macsound/macsound.m since it's got objective C in it.

Known bugs and glitches:

The Hero_playnotes on a set of 5 notes goes too fast, so there
needs to be a slight delay added between the note of a multi-note
play.

sys/unix/hints/linux.370

@@ -113,6 +113,12 @@ endif   #MAKEFILE_SRC
 endif   #HAVE_NCURSESW
 endif   #WANT_WIN_CURSES
 
+# HAVE_SNDLIB could have been set in multiw-2 for Qt.
+# If it is set, add USER_SOUNDS
+ifeq "$(HAVE_SNDLIB)" "1"
+SNDCFLAGS+= -DUSER_SOUNDS
+endif
+
 CFLAGS+= $(WINCFLAGS)	  #WINCFLAGS set from multiw-2.370
 CFLAGS+= $(SNDCFLAGS)     #SNDCFLAGS set from multiw-2.370
 CFLAGS+= $(NHCFLAGS)