The find_package calls need to happen after we set INSTALL_EXAMPLEDIR
to ensure that INSTALL_EXAMPLEDIR is overridden if necessary.
Pick-to: 6.2 6.3 6.4
Task-number: QTBUG-102879
Change-Id: I3c2e6c5a68a8c6ff9b98b79dbd6c83445d8da052
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>