Fix clippy lints on Windows.

Author: Alexhuszagh

.changes/931.json

@@ -2,7 +2,7 @@
     {
         "description": "add support for cargo aliases.",
         "type": "added",
-        "issues": [562],
+        "issues": [562]
     },
     {
         "description": "allow users to ignore config files in the package.",

src/docker/shared.rs

@@ -18,9 +18,6 @@ use crate::rustc::{self, VersionMetaExt};
 use crate::shell::{MessageInfo, Verbosity};
 use crate::Target;
 
-#[cfg(target_os = "windows")]
-use crate::file::PathExt;
-
 pub use super::custom::CROSS_CUSTOM_DOCKERFILE_IMAGE_PREFIX;
 
 pub const CROSS_IMAGE: &str = "ghcr.io/cross-rs";