cataclysm-dda: add missing libX11

Grimmauld aebf0e1e c50cd2dd

+2
+2
pkgs/games/cataclysm-dda/common.nix
··· 10 SDL2_image, 11 SDL2_mixer, 12 SDL2_ttf, 13 freetype, 14 zlib, 15 debug, ··· 31 SDL2_image 32 SDL2_mixer 33 SDL2_ttf 34 freetype 35 ]; 36
··· 10 SDL2_image, 11 SDL2_mixer, 12 SDL2_ttf, 13 + libX11, 14 freetype, 15 zlib, 16 debug, ··· 32 SDL2_image 33 SDL2_mixer 34 SDL2_ttf 35 + libX11 36 freetype 37 ]; 38