Update to latest Rust

src/Tools/psxcdgen_ex/src/encoder/psx.rs

@@ -401,7 +401,7 @@ fn create_dir_record_raw<'a>(dst: &'a mut [u8], name: &str, track_rel_lba: u32,
     }
 
     unsafe {
-        let mut dir_record = std::mem::transmute::<&mut u8, &mut DirectoryRecord>(&mut dst[0]);
+        let dir_record = std::mem::transmute::<&mut u8, &mut DirectoryRecord>(&mut dst[0]);
         dir_record.new(name, has_system_use);
 
         dir_record.data_block_number.write(track_rel_lba);