Defines starting with `l' in scsi

• LD_LOAD scsi/scsi_tape.h:95
• LD_UNLOAD scsi/scsi_tape.h:94
• LEFT_CHANNEL scsi/scsi_cd.h:270
• LEFT_PORT scsi/scsi_cd.h:275
• LOAD_UNLOAD scsi/scsi_tape.h:118