tests/dmesg: handle added carriage return when fixture is checked out on Windows.

tests/by-util/test_dmesg.rs

@@ -17,5 +17,5 @@ fn test_kmsg_json() {
         .arg("--json")
         .run()
         .no_stderr()
-        .stdout_is_fixture("test_kmsg_json.expected");
+        .stdout_is_templated_fixture("test_kmsg_json.expected", &[("\r\n", "\n")]);
 }