Add space between string literal and macro

This fixes compilation with c++11:

    src/ai/ai_plan.cpp:346:58: error: no matching literal operator for call to 'operator  _C_' with arguments of types 'const char *' and 'unsigned long', and no matching literal operator template

Author: AMDmi3

src/ai/ai_plan.cpp

@@ -343,7 +343,7 @@ int GetTotalBoardCapacity(ITERATOR begin, ITERATOR end)
 int AiForce::PlanAttack()
 {
 	CPlayer &player = *AiPlayer->Player;
-	DebugPrint("%d: Planning for force #%lu of player #%d\n"_C_ player.Index
+	DebugPrint("%d: Planning for force #%lu of player #%d\n" _C_ player.Index
 			   _C_(long unsigned int)(this - & (AiPlayer->Force[0])) _C_ player.Index);
 
 	TerrainTraversal transporterTerrainTraversal;

src/stratagus/script.cpp

@@ -772,7 +772,7 @@ NumberDesc *CclParseNumberDesc(lua_State *l)
 			lua_pop(l, 1); // table.
 		} else {
 			lua_pop(l, 1);
-			LuaError(l, "unknow condition '%s'"_C_ key);
+			LuaError(l, "unknow condition '%s'" _C_ key);
 		}
 	} else {
 		LuaError(l, "Parse Error in ParseNumber");
@@ -897,7 +897,7 @@ StringDesc *CclParseStringDesc(lua_State *l)
 			res->D.PlayerName = CclParseNumberDesc(l);
 		} else {
 			lua_pop(l, 1);
-			LuaError(l, "unknow condition '%s'"_C_ key);
+			LuaError(l, "unknow condition '%s'" _C_ key);
 		}
 	} else {
 		LuaError(l, "Parse Error in ParseString");