Fix warnings introduced in newer Rust Nightly

This does not (yet) upgrade ./rust-toolchain

The warnings:

* dead_code "field is never read"
* redundant_semicolons "unnecessary trailing semicolon"
* non_fmt_panic "panic message is not a string literal, this is no longer accepted in Rust 2021"
* unstable_name_collisions "a method with this name may be added to the standard library in the future"
* legacy_derive_helpers "derive helper attribute is used before it is introduced" https://github.com/rust-lang/rust/issues/79202

components/compositing/build.rs

@@ -47,6 +47,6 @@ fn main() {
                 _ => panic!("Cannot find package definitions in lockfile"),
             }
         },
-        Err(e) => panic!(e),
+        Err(e) => panic!("{}", e),
     }
 }