py-cxfreeze: updated to 5.1.1

Version 5.1.1:
Correct code used to identify the directory in which the library and its zip file are located.
Ensure that the pythoncom and pywintypes DLLs are found in the lib directory, not in the base directory.
Copy dependent files to the same directory as the file it depends on, not the root directory; also add a sample for PyQt5 to demonstrate its correct use.

Version 5.1:
Use fixed library location on all platforms; should correct the error ���no module named __startup__���.
Correct sqlite3 hook for use in Python 2.7.
Correct usage of scipy.lib.
Correct handling of __path__ attribute in module.
Fix gevent bug 42.
Droppped support for Python 3.4.

(adam)