Fix for ROOT-9055. Avoid searching in the standard system environment variables (i.e. PATH)
Fix for ROOT-9055. Avoid searching in the standard system environment variables (i.e. PATH)

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