fixes a compiler warning (hopefully since i don't use that compiler)

src/play_controller.hpp

@@ -69,7 +69,7 @@ public:
 	virtual void toggle_grid();
 	virtual void search();
 
-	virtual void play_side(const int team_num) = 0;
+	virtual void play_side(const unsigned int team_num) = 0;
 
 	const int get_ticks();
 

src/playmp_controller.cpp

@@ -47,7 +47,7 @@ void playmp_controller::speak(){
 	menu_handler_.speak();
 }
 
-void playmp_controller::play_side(const int team_index){
+void playmp_controller::play_side(const unsigned int team_index){
 //goto this label if the type of a team (human/ai/networked) has changed mid-turn
 redo_turn:
 	bool player_type_changed_ = false;

src/playmp_controller.hpp

@@ -34,7 +34,7 @@ protected:
 	virtual void clear_labels();
 	virtual bool can_execute_command(hotkey::HOTKEY_COMMAND command) const;
 
-	virtual void play_side(const int team_index);
+	virtual void play_side(const unsigned int team_index);
 	virtual void before_human_turn();
 	virtual void play_human_turn();
 	virtual void after_human_turn();

src/playsingle_controller.cpp

@@ -379,7 +379,7 @@ void playsingle_controller::play_turn(){
 	finish_turn();
 }
 
-void playsingle_controller::play_side(const int team_index){
+void playsingle_controller::play_side(const unsigned int team_index){
 //goto this label if the type of a team (human/ai/networked) has changed mid-turn
 redo_turn:
 	//although this flag is used only in this method it has to be a class member

src/playsingle_controller.hpp

@@ -56,7 +56,7 @@ public:
 
 protected:
 	virtual void play_turn();
-	virtual void play_side(const int team_index);
+	virtual void play_side(const unsigned int team_index);
 	virtual void before_human_turn();
 	virtual void play_human_turn();
 	virtual void after_human_turn();

src/replay_controller.cpp

@@ -235,7 +235,7 @@ void replay_controller::play_turn(){
 	current_turn_++;
 }
 
-void replay_controller::play_side(const int team_index){
+void replay_controller::play_side(const unsigned int team_index){
 	if (recorder.at_end()){
 		return;
 	}

src/replay_controller.hpp

@@ -66,7 +66,7 @@ protected:
 private:
 	void init();
 	virtual void play_turn();
-	virtual void play_side(const int team_index);
+	virtual void play_side(const unsigned int team_index);
 	void update_teams();
 	void update_gui();