qcontainerfwd.h: Do not include variant and tuple

utility is enough to get std::pair; qtypeinfo.h needs to include tuple
now though.

Change-Id: I9feb625f9feb148b3f3133747ab5405c2eca049d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/corelib/global/qtypeinfo.h

@@ -42,6 +42,7 @@
 #include <QtCore/qcontainerfwd.h>
 #include <variant>
 #include <optional>
+#include <tuple>
 
 #ifndef QTYPEINFO_H
 #define QTYPEINFO_H

src/corelib/tools/qcontainerfwd.h

@@ -43,8 +43,7 @@
 #define QCONTAINERFWD_H
 
 // std headers can unfortunately not be forward declared
-#include <tuple>
-#include <variant>
+#include <utility>
 
 QT_BEGIN_NAMESPACE