Fixed reference leak in the "backslashreplace" error handler.

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branch : 2.7
Issue #21866: ZipFile.close() no longer writes ZIP64 central directory
records if allowZip64 is false.

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branch : 2.7
Fixed test_large_file_exception. Ported tests for large count of files
to TestZip64InSmallFiles.

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branch : 2.7
Issue #20912: Now directories added to ZIP file have correct Unix and MS-DOS
directory attributes.

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branch : 2.7
Issue #22471: Avoid Python Launcher.app install problems by removing
vestigial Makefile step.

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branch : 2.7