Qtactiveqt compilation fails in qt5.git integration

We are bringing back those additional libraries in qt5.git from 6.1 ->

Active Qt seems to have some build issue in Linux:

<noformat>
agent:2021/03/23 16:48:59 build.go:379: In file included from src/activeqt/axbase/qaxutils_p.h:65,
agent:2021/03/23 16:48:59 build.go:379: from src/activeqt/axbase/qaxutils.cpp:51:
agent:2021/03/23 16:48:59 build.go:379: /home/qt/work/install/include/QtCore/qt_windows.h:64:10: fatal error: windows.h: No such file or directory
agent:2021/03/23 16:48:59 build.go:379: #include <windows.h>
agent:2021/03/23 16:48:59 build.go:379: ^~~~~~~~~~~
agent:2021/03/23 16:48:59 build.go:379: compilation terminated.
<noformat>

Build log: https://testresults.qt.io/logs/qt/qtactiveqt/231a34aa373e5254c1ac7ef7885894bc1733d33f/LinuxUbuntu_18_04x86_64LinuxUbuntu_18_04x86_64GCCqtci-linux-Ubuntu-18.04-x86_64-50-5b5755Sccache/de481172f808b5ac1c0f23982d998b26e8cba669/build_1616518035/log.txt.gz

Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1616517503

Tested changes (refs/builds/qtci/6.1/1616517502):
https://codereview.qt-project.org/c/qt/qt5/+/339283/1 Change all additional libraries to addons
https://codereview.qt-project.org/c/qt/qt5/+/340330/1 Update submodules in Qt 6.1
https://codereview.qt-project.org/c/qt/qt5/+/339465/1 Revert "Add qttools as additional dependency to additional libraries"