servo: Merge #16061 - Use servo_config::opts only on linux target (from methyl:master); r=Manishearth

It's not used for other architectures and triggers warnings.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #16058
- [x] These changes do not require tests because it's purely refactoring task

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Source-Repo: https://github.com/servo/servo
Source-Revision: 2f6cf2e9c883d919b35d952f47d6bb1670f21def

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : be6d77b4cc810b30ea07eeddd63afda903c84749

servo/components/bluetooth/lib.rs

@@ -7,6 +7,7 @@ extern crate bitflags;
 extern crate bluetooth_traits;
 extern crate device;
 extern crate ipc_channel;
+#[cfg(target_os = "linux")]
 extern crate servo_config;
 extern crate servo_rand;
 #[cfg(target_os = "linux")]
@@ -23,6 +24,7 @@ use bluetooth_traits::scanfilter::{BluetoothScanfilter, BluetoothScanfilterSeque
 use device::bluetooth::{BluetoothAdapter, BluetoothDevice, BluetoothGATTCharacteristic};
 use device::bluetooth::{BluetoothGATTDescriptor, BluetoothGATTService};
 use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
+#[cfg(target_os = "linux")]
 use servo_config::opts;
 use servo_rand::Rng;
 use std::borrow::ToOwned;

servo/components/script/dom/permissions.rs

@@ -17,6 +17,7 @@ use dom_struct::dom_struct;
 use js::conversions::ConversionResult;
 use js::jsapi::{JSContext, JSObject};
 use js::jsval::{ObjectValue, UndefinedValue};
+#[cfg(target_os = "linux")]
 use servo_config::opts;
 use servo_config::prefs::PREFS;
 use std::rc::Rc;