Also make cmake find libraries only from toolchain
Task-number: QTQAINFRA-4580
Change-Id: I5eabaa3b6915e16db6ce152591d3b88bc7483d29
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit cae9a1e8ef)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>