cmake: if not configured by user, enable c++14 for root7
cmake: if not configured by user, enable c++14 for root7

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root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,karies/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,karies/root,karies/root