[bindings] Allow write_rust_type to handle leading-colon paths

It just stubs out to `write_rust_path` in this case anyway, which
handles leading-colons just fine, so no need to panic on them.

Author: TheBlueMatt

c-bindings-gen/src/types.rs

@@ -1061,7 +1061,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
 	pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
 		match t {
 			syn::Type::Path(p) => {
-				if p.qself.is_some() || p.path.leading_colon.is_some() {
+				if p.qself.is_some() {
 					unimplemented!();
 				}
 				self.write_rust_path(w, generics, &p.path);