misc: Allow shared reference to mutable static

We know what we are doing within `tracer` crate, disable lint on these
shared reference to mutable static.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

tracer/src/tracer.rs

@@ -3,6 +3,8 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+#![allow(static_mut_refs)]
+
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::Write;