servo: Merge #19562 - Make layout depend on style/servo feature (from mbrubeck:feature); r=emilio

This fixes an error when running commands like `./mach check -p layout`.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they change build metadata only

Source-Repo: https://github.com/servo/servo
Source-Revision: bc9062b689706f481f5865e38e856cce0eeccb61

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : e59c9eb9a54d3095ba945500deb80efd404e1f8b

servo/components/layout/Cargo.toml

@@ -41,7 +41,7 @@ serde_json = "1.0"
 servo_config = {path = "../config"}
 servo_url = {path = "../url"}
 smallvec = "0.6"
-style = {path = "../style"}
+style = {path = "../style", features = ["servo"]}
 style_traits = {path = "../style_traits"}
 unicode-bidi = {version = "0.3", features = ["with_serde"]}
 unicode-script = {version = "0.1", features = ["harfbuzz"]}