CMake IMPORTED targets should be namespaced so that CMake knows that
the name refers to a target and not a file.
Use the existing WrapXXX naming scheme where applicable.
Fixes: QTBUG-83773
Change-Id: I5b0b722c811200c56c260c69e76940a625228769
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>