adapt to new build scheme, add libdir option to tsuite.sh and ctbm.py

Change-Id: I46e3efa45cff37facb3fb3e439e7247df8e5af81
Reviewed-on: https://gerrit.aug.ipp.mpg.de/c/ipp/aug/ecrh/pytorbeam/+/10252


Reviewed-by: Matthias Reich <matthias.reich@ipp.mpg.de>
Tested-by: Matthias Reich <matthias.reich@ipp.mpg.de>