First access to QSettings("HKEY_CLASSES_ROOT").childGroups() has "*" node

The issue was revealed while attempt to integrate: https://codereview.qt-project.org/c/qt/qt5/+/622722/11

There is no direct impact from the patchsets in the chain on QSettings or qtbuild. It's preliminary changes that will be used later. Meanwhile tst_qsettings fails on ARM64 windows VM when the respective vcpkg ports are provisioned.

The reason is the tst_QSettings::testRegistryShortRootNames() test case:

QVERIFY(QSettings("HKEY_CLASSES_ROOT", QSettings::NativeFormat).childGroups() == QSettings("HKCR", QSettings::NativeFormat).childGroups());

On the VM it fails because the QSettings::childGroups for "HKEY_CLASSES_ROOT"(full name) return the list containing the preceding *(asterisk) node, while "HKCR" doesn't.

Meanwhile calling the same method on the same QSettings instance second time lacks the
*(asterisk) node and the test case passes. Same when calling it on a new QSettings instance.