Fix unused code / imports in the examples

examples/src/bin/debug.rs

@@ -7,7 +7,6 @@
 // notice may not be copied, modified, or distributed except
 // according to those terms.
 
-#[macro_use]
 extern crate vulkano;
 
 use vulkano::device::{Device, DeviceExtensions};

examples/src/bin/triangle.rs

@@ -17,6 +17,8 @@
 // and that you want to learn Vulkan. This means that for example it won't go into details about
 // what a vertex or a shader is.
 
+// For the purpose of this example all unused code is allowed.
+#![allow(dead_code)]
 
 // The `vulkano` crate is the main crate that you must use to use Vulkan.
 #[macro_use]