Add spacing information to delimiters.

This is an extension of the previous commit. It means the output of
something like this:
```
stringify!(let a: Vec<u32> = vec![];)
```
goes from this:
```
let a: Vec<u32> = vec![] ;
```
With this PR, it now produces this string:
```
let a: Vec<u32> = vec![];
```

Author: nnethercote

clippy_lints/src/crate_in_macro_def.rs

@@ -92,7 +92,7 @@ fn contains_unhygienic_crate_reference(tts: &TokenStream) -> Option<Span> {
         {
             return Some(span);
         }
-        if let TokenTree::Delimited(_, _, tts) = &curr {
+        if let TokenTree::Delimited(.., tts) = &curr {
             let span = contains_unhygienic_crate_reference(tts);
             if span.is_some() {
                 return span;