Variables starting with `b' in src/od-amiga

• basevsynctime src/od-amiga/sound.c:89
• buffers src/od-amiga/sound.c:111
• bufidx src/od-amiga/sound.c:115
• bufsamples src/od-amiga/sound.c:90
• buttonstate src/od-amiga/ami-win.c:210