Fix the wrong removal of first linker arg in Windows. Linker argument file no longer include first program name argument. Small refactor of handling of linker response file. (#5010)

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>

packages/cli/src/rustcwrapper.rs

@@ -26,7 +26,8 @@ pub fn is_wrapping_rustc() -> bool {
 pub struct RustcArgs {
     pub args: Vec<String>,
     pub envs: Vec<(String, String)>,
-    pub link_args: Vec<String>, // I don't believe this is used anymore
+    /// it doesn't include first program name argument
+    pub link_args: Vec<String>,
 }
 
 /// Check if the arguments indicate a linking step, including those in command files.