Use locally built cargo-clippy instead of the one from the system

Author: oli-obk

tests/compile-test.rs

@@ -115,7 +115,11 @@ fn run_ui_cargo() {
         "target/ui_test_cargo".into(),
         "--manifest-path".into(),
     ];
-    config.program = "cargo".into();
+    config.program.set_file_name(if cfg!(windows) {
+        "cargo-clippy.exe"
+    } else {
+        "cargo-clippy"
+    });
     config.out_dir = None;
     config.edition = None;