Auto merge of #20666 - servo:url, r=nox

Fix building servo_url by itself

Fix #20664

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20666)
<!-- Reviewable:end -->

components/url/Cargo.toml

@@ -10,9 +10,9 @@ name = "servo_url"
 path = "lib.rs"
 
 [dependencies]
-malloc_size_of = { path = "../malloc_size_of" }
+malloc_size_of = { path = "../malloc_size_of", features = ["servo"] }
 malloc_size_of_derive = { path = "../malloc_size_of_derive" }
-serde = {version = "1.0"}
+serde = {version = "1.0", features = ["derive"]}
 servo_rand = {path = "../rand"}
 url = "1.2"
 url_serde = {version = "0.2"}