add sparse.h to public header so dependencies can use it in amalgamated source
@@ -455,6 +455,7 @@ struct ecs_observer_t {
#include "flecs/private/api_types.h" /* Supporting API types */
#include "flecs/private/api_support.h" /* Supporting API functions */
+#include "flecs/private/sparse.h" /* Sparse set */
#include "flecs/private/hashmap.h" /* Hashmap */
#include "flecs/type.h" /* Type API */
