Instead of checking if QT_HOST_PATH is set during user project
configuration to find out if Qt6HostInfo should be looked up,
record if QT_HOST_PATH was provided during Qt configuration
into Qt6Dependencies.cmake and look up the package in a user
project based on that information.
This improves handling of the case where cmake is directly used
to configure a Qt project (instead of qt-cmake), which means no
QT_HOST_PATH might be set by the user, and then cmake would error out
saying that e.g. Qt6CoreTools is not found, instead of saying that
Qt6HostInfo is not found.
Pick-to: 6.4
Task-number: QTBUG-104998
Change-Id: I0377d5440e4b5b295af73cfd4b5188f61d48e440
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
7b24ffa936