Update vendored windows libs

libs/win/incubator/trace-symlink.py

@@ -0,0 +1,22 @@
+from jaraco.windows.filesystem import trace_symlink_target
+
+from optparse import OptionParser
+
+
+def get_args():
+    parser = OptionParser()
+    options, args = parser.parse_args()
+    try:
+        options.filename = args.pop(0)
+    except IndexError:
+        parser.error('filename required')
+    return options
+
+
+def main():
+    options = get_args()
+    print(trace_symlink_target(options.filename))
+
+
+if __name__ == '__main__':
+    main()