Move CString to where it's actually used
Move CString to where it's actually used

src/feature/xattr.rs:6:5: 6:22 warning: unused import, #[warn(unused_imports)] on by default
src/feature/xattr.rs:6 use std::ffi::CString;
                           ^~~~~~~~~~~~~~~~~

kbknapp/exa,ogham/exa,ogham/exa,kbknapp/exa