Issue #4844: ZipFile now raises BadZipfile when opens a ZIP file with an
incomplete "End of Central Directory" record.  Original patch by Guilherme
Polo and Alan McIntyre.
Issue #17049: Localized calendar methods now return unicode if a locale
includes an encoding and the result string contains month or weekday (was
regression from Python 2.6).
Issue #17041: Fix doctesting when Python is configured with the
--without-doc-strings.
- Issue #17086: Backport the patches from the 3.3 branch to cross-build
  the package.
#16128: clarify that instances of user-defined classes compare equal with themselves.