Mac OS X work...lots of little changes that touch a lot of random places.

Still work to be done, but this at least matches the PowerPC Linux status
 now.

MacOS-specific directory (and XCode project) is gone...this now uses SDL,
 OpenAL, and the Unix Makefiles.

--ryan.

code/unix/sdl_snd.c

@@ -81,6 +81,10 @@ https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=371
 <TTimo> and use my own copy instead of the glibc crap
 ===============
 */
+
+#ifdef Snd_Memset
+#undef Snd_Memset
+#endif
 void Snd_Memset (void* dest, const int val, const size_t count)
 {
 	int *pDest;