releasetools: Add a note for the ZipInfo._decodeExtra() workaround.

import common

# Work around a bug in python's zipfile module that prevents opening

# of zipfiles if any entry has an extra field of between 1 and 3 bytes

# (which is common with zipaligned APKs).  This overrides the

# ZipInfo._decodeExtra() method (which contains the bug) with an empty

# version (since we don't need to decode the extra field anyway).

# Work around a bug in Python's zipfile module that prevents opening of zipfiles

# if any entry has an extra field of between 1 and 3 bytes (which is common with

# zipaligned APKs). This overrides the ZipInfo._decodeExtra() method (which

# contains the bug) with an empty version (since we don't need to decode the

# extra field anyway).

# Issue #14315: https://bugs.python.org/issue14315, fixed in Python 2.7.8 and

# Python 3.5.0 alpha 1.

class MyZipInfo(zipfile.ZipInfo):

  def _decodeExtra(self):

    pass