rootbench
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Expose CXX standard in rootbench
We require an exposed CMAKE_CXX_STANDARD in rootbench. Currenlty, it's not there or only in the case of being builtin with root. The hotfix looks like this but does not cover correctly the case "standard > 14" with an external build of rootbench.
Duplicate of https://github.com/root-project/root/issues/7644