Fix unresolved imports from krun_sys in muvm binary

[MR-UNKNOWN74IDK]

Removed unresolved imports and function calls that no longer exist in
the krun_sys bindings.

• Removed krun_set_root from the krun_sys imports
• Removed the krun_set_root() function call that sets the root path

The krun_set_root function is no longer available in the current
version of krun_sys. The root path configuration may now be handled
by a different mechanism or is no longer necessary.

Fixes compilation error:
error[E0432]: unresolved imports krun_sys::krun_set_root