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rgb_map(3alleg4) on Linux

The text 1bec6fb7b2ce, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.

Look up table to speed up reducing RGB values to palette colors. Allegro game programming library.

rgb_map(3alleg4) on Linux now