Typedefs in src/od-dos/sound

• BOOL src/od-dos/sound/sb.h:10
• bytes src/od-dos/sound/sb.c:75
• sample8_t src/od-dos/sound/sound.c:29
• tDMABuffer src/od-dos/sound/sb.c:82
• tSBType src/od-dos/sound/sb.h:18