Simplify locating script

Author: clubby789

src/toolchains.rs

@@ -238,17 +238,9 @@ impl Toolchain {
                     .join(&format!("target-{}", self.rustup_name())),
             );
         }
-        let mut script = cfg.args.script.clone();
-        if let Some(path) = &script {
-            if !path.is_absolute() && !path.starts_with("./") && !path.starts_with(".\\") {
-                if let Ok(mut dir) = std::env::current_dir() {
-                    dir.push(path);
-                    if dir.is_file() {
-                        script = Some(dir)
-                    }
-                }
-            }
-        }
+        let script = cfg.args.script.as_ref().map(|script| {
+            std::env::current_dir().unwrap().join(script)
+        });
 
         let mut cmd = match (script, cfg.args.timeout) {
             (Some(script), None) => {