Removed cases of inheritance from the deprecated std::unary_function

src/gui/dialogs/lobby/data.hpp

@@ -187,7 +187,7 @@ struct game_info
 	const char* display_status_string() const;
 };
 
-class game_filter_base : public std::unary_function<game_info, bool>
+class game_filter_base
 {
 public:
 	virtual ~game_filter_base()

src/pathutils.hpp

@@ -21,7 +21,7 @@
 
 class gamemap;
 
-class xy_pred : public std::unary_function<map_location const&, bool>
+class xy_pred
 {
 public:
 	virtual bool operator()(map_location const&) const = 0;