Mark goal_action_is_replay as LIBDNF_API to fix build

PR that adds the API (rpm-software-management#1452)
was merged right before rpm-software-management#1307
so its missing there.

include/libdnf5/base/goal_elements.hpp

@@ -157,7 +157,7 @@ enum class GoalAction {
 LIBDNF_API std::string goal_action_to_string(GoalAction action);
 
 /// Check whether the action is a replay action
-bool goal_action_is_replay(GoalAction action);
+LIBDNF_API bool goal_action_is_replay(GoalAction action);
 
 /// Settings for GoalJobSettings
 enum class GoalSetting { AUTO, SET_TRUE, SET_FALSE };