[cmake] Fix detection of master for ROOT_VERSION.
[cmake] Fix detection of master for ROOT_VERSION.

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