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Export list of hwthreads to wrapped application

Thomas Gruber requested to merge export_likwid_env into master

Created by: TomTheBear

This PR adds the export of the used HW threads through the environment variable LIKWID_HWTHREADS so that applications can use this knowledge. There is already an environment variable LIKWID_THREADS but it only exported by likwid-perfctr in MarkerAPI mode. In some cases, you need the knowledge also in non-instrumented applications.

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