cpiofile: revert copyright notice change
cpiofile: revert copyright notice change

7dc5f340fd62242726fb6e76b293e02b3c67eb8e was a bit too eager, and changed
the license of this file derived from code in the CPython distribution.

Signed-off-by: Yann Dirson <9a3266eb84fe75b6e4a0d9d8e42ed70b568ec175@vates.fr>

xenserver/python-libs,xenserver/python-libs