fix(preprocessor): initialize tm structure (#96)

include/xsk/gsc/preprocessor.hpp

@@ -83,6 +83,7 @@ private:
     auto eval_expr_factor() -> i32;
     auto eval_expr_unary() -> i32;
     auto eval_expr_primary() -> i32;
+    auto get_local_time(std::tm& ltime) -> void;
     auto get_date_define(std::tm* time_p) -> void;
     auto get_time_define(std::tm* time_p) -> void;
 };