tests/basics: Add test for tuple compare with class derived from tuple.

Only the "==" operator was tested by the test suite in for such arguments.
Other comparison operators like "<" take a different path in the code so
need to be tested separately.

tests/basics/subclass_native_cmp.py

@@ -7,3 +7,6 @@ t = mytuple((1, 2, 3))
 print(t)
 print(t == (1, 2, 3))
 print((1, 2, 3) == t)
+
+print(t < (1, 2, 3), t < (1, 2, 4))
+print((1, 2, 3) <= t, (1, 2, 4) < t)