tail: Ignore a test on selinux

test_follow_when_files_are_pointing_to_same_relative_file_and_file_stays_same_size is flaky

Author: sylvestre

tests/by-util/test_tail.rs

@@ -4379,7 +4379,8 @@ fn test_args_when_directory_given_shorthand_big_f_together_with_retry() {
     not(target_vendor = "apple"),
     not(target_os = "windows"),
     not(target_os = "freebsd"),
-    not(target_os = "openbsd")
+    not(target_os = "openbsd"),
+    not(feature = "feat_selinux") // flaky
 ))]
 fn test_follow_when_files_are_pointing_to_same_relative_file_and_file_stays_same_size() {
     let scene = TestScenario::new(util_name!());