Fix SystemTime serialization test on Windows

Windows's `SystemTime` do not have nanosecond resolution which caused the test duration to be truncated b1363a73ed/src/libstd/sys/windows/time.rs (L177)

test_suite/tests/test_ser.rs

@@ -331,13 +331,13 @@ declare_tests! {
         ],
     }
     test_system_time {
-        UNIX_EPOCH + Duration::new(1, 2) => &[
+        UNIX_EPOCH + Duration::new(1, 200) => &[
             Token::Struct { name: "SystemTime", len: 2 },
                 Token::Str("secs_since_epoch"),
                 Token::U64(1),
 
                 Token::Str("nanos_since_epoch"),
-                Token::U32(2),
+                Token::U32(200),
             Token::StructEnd,
         ],
     }