Defines starting with `b' in bsd/nfs

• B_INVAFTERWRITE bsd/nfs/nfs.h:119
• BOOTPARAM_GETFILE bsd/nfs/krpc.h:63
• BOOTPARAM_PROG bsd/nfs/krpc.h:60
• BOOTPARAM_VERS bsd/nfs/krpc.h:61
• BOOTPARAM_WHOAMI bsd/nfs/krpc.h:62