Remove the redundant combat_terrain array

osx/boe.main.cpp

@@ -116,7 +116,6 @@ location spell_targets[8];
 /* Combat globals */
 short which_combat_type;
 location center;
-ter_num_t combat_terrain[64][64];
 short current_pc;
 short combat_active_pc;
 effect_pat_type current_pat;