Issue #13590: OS X Xcode 4 - improve support for universal extension modules
    In particular, fix extension module build failures when trying to use
    32-bit-only installer Pythons on systems with Xcode 4 (currently
    OS X 10.8, 10.7, and optionally 10.6).
    * Backport 3.3.0 fixes to 3.2 branch (for release in 3.2.4)
    * Since Xcode 4 removes ppc support, extension module builds now
      check for ppc compiler support and by default remove ppc and
      ppc64 archs when they are not available.
    * Extension module builds now revert to using system installed
      headers and libs (/usr and /System/Library) if the SDK used
      to build the interpreter is not installed or has moved.
    * Try to avoid building extension modules with deprecated
      and problematic Apple llvm-gcc compiler.  If original compiler
      is not available, use clang instead by default.
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.
Added test to ensure localized calendar methods return strings and not bytes.
Issue #17041: Fix doctesting when Python is configured with the
--without-doc-strings.