[issue1886] Permit to easily use distutils "--formats=tar, gztar, bztar" on all systems

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

Both things fixed. The new patch is in attachment.

Just one thing: I tried a diff between a tar.gz file generated by
tarfile module and another one generated by the UNIX tar utility and it
seems there are some differences.
I don't know if this could represent a problem for distributions
generated by distutils and eventually easy_install.py integration.
Maybe someone who knows the tarfile implementation could clarify this point.

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nosy: +lars.gustaebel, nnorwitz
Added file: http://bugs.python.org/file9262/patch.zip

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