derive: use absolute path to fix use in no_std crate

derive/src/lib.rs

@@ -45,7 +45,7 @@ fn expand_derive_arbitrary(input: syn::DeriveInput) -> Result<TokenStream> {
 
     Ok(quote! {
         const _: () = {
-            thread_local! {
+            std::thread_local! {
                 #[allow(non_upper_case_globals)]
                 static #recursive_count: std::cell::Cell<u32> = std::cell::Cell::new(0);
             }