Defines starting with `l' in scsi

• LD_LOAD scsi/scsi_tape.h:118
• LD_UNLOAD scsi/scsi_tape.h:117
• LEFT_CHANNEL scsi/scsi_cd.h:278
• LEFT_PORT scsi/scsi_cd.h:283
• LOAD_UNLOAD scsi/scsi_tape.h:141