style: Disable rustfmt for now.

Tons of people have broken rustfmts that cause build errors. Let's not force
them to update it for now.

components/style/build_gecko.rs

@@ -204,7 +204,11 @@ mod bindings {
 
             // Disable rust unions, because we replace some types inside of
             // them.
+            //
+            // FIXME(emilio, bug 1432153): Make the bindings rustfmt'd on
+            // automation.
             let mut builder = Builder::default()
+                .rustfmt_bindings(false)
                 .rust_target(RustTarget::Stable_1_0);
             for dir in SEARCH_PATHS.iter() {
                 builder = builder.clang_arg("-I").clang_arg(dir.to_str().unwrap());