test: headers cleanup

test/entt/entity/organizer.cpp

@@ -1,6 +1,7 @@
 #include <array>
 #include <cstddef>
 #include <utility>
+#include <vector>
 #include <gtest/gtest.h>
 #include <entt/core/type_info.hpp>
 #include <entt/entity/group.hpp>

test/entt/process/process.cpp

@@ -2,7 +2,6 @@
 #include <memory>
 #include <gtest/gtest.h>
 #include <entt/process/process.hpp>
-#include "../../common/config.h"
 #include "../../common/empty.h"
 
 template<typename Delta>

test/entt/process/scheduler.cpp

@@ -1,10 +1,10 @@
+#include <cstdint>
 #include <functional>
 #include <memory>
 #include <utility>
 #include <gtest/gtest.h>
 #include <entt/process/process.hpp>
 #include <entt/process/scheduler.hpp>
-#include "../../common/config.h"
 
 class foo_process: public entt::process {
     void update(const delta_type, void *) override {