Importing readline can crash on some Linux systems (conflict with LLVM's libedit) - full description here: T43491#291613

Since we don't infact use readline in Blender, this patch just works around the problem by not loading it.

While ideally we could support readline, the error is a conflict between LLVM and Python, which we dont have control over in Linux distributions.
so this workaround could at least let the py-console be usable for now.