test: cleanup

test/entt/core/bit.cpp

@@ -1,9 +1,5 @@
-#include <cmath>
-#include <cstddef>
-#include <limits>
 #include <gtest/gtest.h>
 #include <entt/core/bit.hpp>
-#include "../../common/config.h"
 
 TEST(Bit, FastMod) {
     // constexpr-ness guaranteed

test/entt/meta/meta_data.cpp

@@ -1,4 +1,3 @@
-#include <cstdlib>
 #include <string>
 #include <string_view>
 #include <utility>

test/entt/meta/meta_factory.cpp

@@ -4,7 +4,6 @@
 #include <utility>
 #include <gtest/gtest.h>
 #include <entt/core/type_info.hpp>
-#include <entt/locator/locator.hpp>
 #include <entt/meta/context.hpp>
 #include <entt/meta/factory.hpp>
 #include <entt/meta/meta.hpp>