Replace log with tracing

Tracing is a modern replacement for the log crate that allows for
annotating log messages with the function that they come from.

Signed-off-by: John Nunley <dev@notgull.net>
Closes: #3482

src/platform_impl/linux/mod.rs

@@ -687,7 +687,7 @@ unsafe extern "C" fn x_error_callback(
 
         // Don't log error.
         if !error_handled {
-            log::error!("X11 error: {:#?}", error);
+            tracing::error!("X11 error: {:#?}", error);
             // XXX only update the error, if it wasn't handled by any of the hooks.
             *xconn.latest_error.lock().unwrap() = Some(error);
         }