switch to tbb2020
tbb2019 fails clang compilation on my test system for llvm-6.0 and llvm-8.0, while the CERN installation llvm-6.0 seems to succeed in CI. Upgrading to tbb2020 avoids these issues.
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tbb2019 fails clang compilation on my test system for llvm-6.0 and llvm-8.0, while the CERN installation llvm-6.0 seems to succeed in CI. Upgrading to tbb2020 avoids these issues.