Revert "python3: add patch to fix PEP 3147 issue with automake built packages"

This reverts commit b5868535, which
causes some build failures of Python 3:

  http://autobuild.buildroot.org/results/923/923c4242dbd6d277c1d88f663b5916ceced985d4/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>