Change check whether TBB was found by cmake-config file

Summary

The find_package(TBB) with as follows: 1. search for TBBConfig.cmake and if found use that configuration, otherwise 2. search for tbb.pc pkg-config file and use that configuration. To decide whether the first step was successfull, I have to check whether the TBB package was found and that the corresponding TBB::tbb target is available in the package. Otherwise this package would not be usable for us.

added buildsystem label

added bug label

merged

mentioned in commit 0c8f2fc9

mentioned in issue #199 (closed)