Disable LLVM optional components not used by ROOT
Disable LLVM optional components not used by ROOT

This avoids auto-detection of optional LLVM features by
searching for the packages in the system, which could lead
to problems if our binaries are built on a machine where one
of these is installed, and run on a machine where it's not.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root