Update bindgen.

We updated it in Gecko and this is preventing me from syncing stuff with Servo.

Author: emilio

Cargo.toml

@@ -2,7 +2,7 @@
 name = "mozjs_sys"
 description = "System crate for the Mozilla SpiderMonkey JavaScript engine."
 repository = "https://github.com/servo/mozjs/"
-version = "0.61.2"
+version = "0.61.3"
 authors = ["Mozilla"]
 links = "mozjs"
 build = "build.rs"
@@ -26,5 +26,5 @@ libc = "0.2"
 libz-sys = "1.0"
 
 [build-dependencies]
-bindgen = "0.39"
+bindgen = "0.43"
 cc = "1.0"