Defines in src/od-dos/video

• CURSOFF src/od-dos/video/conio-ui.c:29
• CURSON src/od-dos/video/conio-ui.c:28
• PACKED src/od-dos/video/vbe.c:21
• SCROFF src/od-dos/video/conio-ui.c:31
• SCRON src/od-dos/video/conio-ui.c:30
• TB src/od-dos/video/conio-ui.c:26
• TC src/od-dos/video/conio-ui.c:27