Revert alexcrichton/cargo-vendor#131

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

Author: 0xPoe

src/cargo/ops/vendor.rs

@@ -102,44 +102,6 @@ fn sync(
         }
     }
 
-    // First up attempt to work around rust-lang/cargo#5956. Apparently build
-    // artifacts sprout up in Cargo's global cache for whatever reason, although
-    // it's unsure what tool is causing these issues at this time. For now we
-    // apply a heavy-hammer approach which is to delete Cargo's unpacked version
-    // of each crate to start off with. After we do this we'll re-resolve and
-    // redownload again, which should trigger Cargo to re-extract all the
-    // crates.
-    //
-    // Note that errors are largely ignored here as this is a best-effort
-    // attempt. If anything fails here we basically just move on to the next
-    // crate to work with.
-    for ws in workspaces {
-        let (packages, resolve) =
-            ops::resolve_ws(ws).with_context(|| "failed to load pkg lockfile")?;
-
-        packages
-            .get_many(resolve.iter())
-            .with_context(|| "failed to download packages")?;
-
-        for pkg in resolve.iter() {
-            // Don't delete actual source code!
-            if pkg.source_id().is_path() {
-                if let Ok(path) = pkg.source_id().url().to_file_path() {
-                    if let Ok(path) = try_canonicalize(path) {
-                        to_remove.remove(&path);
-                    }
-                }
-                continue;
-            }
-            if pkg.source_id().is_git() {
-                continue;
-            }
-            if let Ok(pkg) = packages.get_one(pkg) {
-                drop(fs::remove_dir_all(pkg.manifest_path().parent().unwrap()));
-            }
-        }
-    }
-
     let mut checksums = HashMap::new();
     let mut ids = BTreeMap::new();