Clone roottest from release tag when configuring with release tarball
Clone roottest from release tag when configuring with release tarball

Fixes: ROOT-9647

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