Remove unused imports

Author: sgrif

src/cargo/util/errors.rs

@@ -307,7 +307,6 @@ pub fn process_error(
 
     #[cfg(unix)]
     fn status_to_string(status: ExitStatus) -> String {
-        use libc;
         use std::os::unix::process::*;
 
         if let Some(signal) = status.signal() {

src/cargo/util/paths.rs

@@ -217,7 +217,6 @@ pub fn path2bytes(path: &Path) -> CargoResult<&[u8]> {
 
 #[cfg(unix)]
 pub fn bytes2path(bytes: &[u8]) -> CargoResult<PathBuf> {
-    use std::ffi::OsStr;
     use std::os::unix::prelude::*;
     Ok(PathBuf::from(OsStr::from_bytes(bytes)))
 }