Defines starting with `b' in bsd/nfs

• B_INVAFTERWRITE bsd/nfs/nfs.h:116
• BOOTPARAM_GETFILE bsd/nfs/krpc.h:60
• BOOTPARAM_PROG bsd/nfs/krpc.h:57
• BOOTPARAM_VERS bsd/nfs/krpc.h:58
• BOOTPARAM_WHOAMI bsd/nfs/krpc.h:59