Defines starting with `b' in pcfs

• BOOTSIG pcfs/bootsect.h:34
• bsBytesPerSec pcfs/bootsect.h:61
• bsFATS pcfs/bootsect.h:64
• bsFATsecs pcfs/bootsect.h:68
• bsHeads pcfs/bootsect.h:70
• bsHiddenSecs pcfs/bootsect.h:71
• bsHugeSectors pcfs/bootsect.h:72
• bsMedia pcfs/bootsect.h:67
• bsResSectors pcfs/bootsect.h:63
• bsRootDirEnts pcfs/bootsect.h:65
• bsSectors pcfs/bootsect.h:66
• bsSectPerClust pcfs/bootsect.h:62
• bsSectPerTrack pcfs/bootsect.h:69