All symbols starting with `n' in src/od-dos/video

• NeedDither src/od-dos/video/video.c:46
• needmousehack src/od-dos/video/video.c:358
• NULL src/od-dos/video/vbe.c:25
• NULL_ChangeBank src/od-dos/video/vbe.c:294
• NumberOfModes src/od-dos/video/vbe.c:24
• numgfxitems src/od-dos/video/video.c:129