See if we can remove symlinks this way on windows (#301)

Author: Byron

git-worktree/src/index/checkout.rs

@@ -36,6 +36,7 @@ pub struct PathCache {
 
 mod cache {
     use super::PathCache;
+    use crate::os;
     use std::path::{Path, PathBuf};
 
     impl PathCache {
@@ -106,7 +107,7 @@ mod cache {
                                 if !meta.is_dir() {
                                     if self.unlink_on_collision {
                                         if meta.is_symlink() {
-                                            symlink::remove_symlink_auto(&self.valid)?;
+                                            os::remove_symlink(&self.valid)?;
                                         } else {
                                             std::fs::remove_file(&self.valid)?;
                                         }

git-worktree/src/index/entry.rs

@@ -132,7 +132,7 @@ fn try_unlink_path_recursively(path: &Path, path_meta: &std::fs::Metadata) -> st
     if path_meta.is_dir() {
         std::fs::remove_dir_all(path)
     } else if path_meta.is_symlink() {
-        symlink::remove_symlink_auto(path)
+        os::remove_symlink(path)
     } else {
         std::fs::remove_file(path)
     }

git-worktree/src/os.rs

@@ -14,7 +14,12 @@ pub fn remove_symlink(path: &Path) -> io::Result<()> {
 
 #[cfg(windows)]
 pub fn remove_symlink(path: &Path) -> io::Result<()> {
-    symlink::remove_symlink_auto(path)
+    let meta = std::fs::metadata(path)?;
+    if meta.is_dir() {
+        std::fs::remove_dir(path)
+    } else {
+        std::fs::remove_file(path)
+    }
 }
 
 #[cfg(windows)]