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

[Phillip J. Eby]

Phillip J. Eby added the comment:

On systems where the gzip or bz2 modules aren't installed, this patch
can raise a tarfile.CompressionError, which should be caught and handled
correctly.  The import of tarfile should also be inside the relevant
function (as is done for make_zipfile) instead of at the top level.

Other than those two points, the patch looks great.

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nosy: +pje

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