Adding cython v0.20.2 in third-party.

third_party/cython/src/pyximport/test/test_reload.py

+# reload seems to work for Python 2.3 but not 2.2. 
+import time, os, sys
+import test_pyximport
+
+# debugging the 2.2 problem
+if 1:
+    from distutils import sysconfig
+    try:
+        sysconfig.set_python_build()
+    except AttributeError:
+        pass
+    import pyxbuild
+    print pyxbuild.distutils.sysconfig == sysconfig
+
+def test():
+    tempdir = test_pyximport.make_tempdir()
+    sys.path.append(tempdir)
+    hello_file = os.path.join(tempdir, "hello.pyx")
+    open(hello_file, "w").write("x = 1; print x; before = 'before'\n")
+    import hello
+        assert hello.x == 1
+
+    time.sleep(1) # sleep to make sure that new "hello.pyx" has later
+              # timestamp than object file.
+
+    open(hello_file, "w").write("x = 2; print x; after = 'after'\n")
+    reload(hello)
+    assert hello.x == 2, "Reload should work on Python 2.3 but not 2.2"
+    test_pyximport.remove_tempdir(tempdir)
+
+if __name__=="__main__":
+    test()
+