Drop spurious restriction on generics in tuple struct fields

There's no need for this assertion, the code should be the same
between named fields and tuple fields.

Author: TheBlueMatt

c-bindings-gen/src/main.rs

@@ -981,8 +981,6 @@ fn writeln_struct<'a, 'b, W: std::io::Write>(w: &mut W, s: &'a syn::ItemStruct,
 				write!(w, "\t}}").unwrap();
 			},
 			syn::Fields::Unnamed(fields) => {
-				assert!(!s.generics.params.iter()
-					.any(|gen| if let syn::GenericParam::Lifetime(_) = gen { false } else { true }));
 				writeln!(w, "{} (", types.maybe_resolve_ident(&s.ident).unwrap()).unwrap();
 				for (idx, field) in fields.unnamed.iter().enumerate() {
 					write!(w, "\t\t").unwrap();