Merge pull request #7760 from Qelxiros/7670-tail-hex-formatting

tail hex parsing, remove fundu dependency

fuzz/fuzz_targets/fuzz_parse_time.rs

@@ -5,6 +5,7 @@ use uucore::parser::parse_time;
 
 fuzz_target!(|data: &[u8]| {
     if let Ok(s) = std::str::from_utf8(data) {
-        _ = parse_time::from_str(s);
+        _ = parse_time::from_str(s, true);
+        _ = parse_time::from_str(s, false);
     }
 });