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/client/snd_codec_wav.c

@@ -42,7 +42,7 @@ static int FGetLittleLong( fileHandle_t f ) {
 FGetLittleShort
 =================
 */
-static int FGetLittleShort( fileHandle_t f ) {
+static short FGetLittleShort( fileHandle_t f ) {
 	short	v;
 
 	FS_Read( &v, sizeof(v), f );