Adjust a few more locations

rls/src/build/rustc.rs

diff --git a/rls/src/build/rustc.rs b/rls/src/build/rustc.rs
index 9f894ea..e684d03 100644
--- a/rls/src/build/rustc.rs
+++ b/rls/src/build/rustc.rs
@@ -239,7 +239,7 @@
         let input = compiler.input();
         let crate_name = queries.crate_name().unwrap().peek().clone();
 
-        let cwd = &sess.working_dir.local_path_if_available();
+        let cwd = &sess.opts.working_dir.local_path_if_available();
 
         let src_path = match input {
             Input::File(ref name) => Some(name.to_path_buf()),
@@ -327,7 +327,7 @@
 }
 
 fn fetch_input_files(sess: &Session) -> Vec<PathBuf> {
-    let cwd = &sess.working_dir.local_path_if_available();
+    let cwd = &sess.opts.working_dir.local_path_if_available();
 
     sess.source_map()
         .files()