manaplus: add missing libX11

Grimmauld c4a55c2a db355161

+2
+2
pkgs/by-name/ma/manaplus/package.nix
··· 13 13 curl, 14 14 libxml2, 15 15 libpng, 16 + libX11, 16 17 pkg-config, 17 18 libGL, 18 19 autoreconfHook, ··· 53 54 curl 54 55 libGL 55 56 libpng 57 + libX11 56 58 libxml2 57 59 physfs 58 60 zlib