Yet another GCC and Clang fix.
int32_t hi, \
ecs_order_by_action_t order_by) \
{ \
- ECS_UNUSED(order_by); \
+ (void)(order_by); \
int32_t p = (hi + lo) / 2; \
void *pivot = ECS_ELEM(ptr, elem_size, p); \
ecs_entity_t pivot_e = entities[p]; \
