Fix zip downloads. Python 2.5 respects the `create_system` attribute of !ZipInfo. As a result, we need to explicitly set the `external_attr` attribute on Unix.
Fix zip downloads. Python 2.5 respects the `create_system` attribute of !ZipInfo. As a result, we need to explicitly set the `external_attr` attribute on Unix.

Closes #6851.

git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@6558 af82e41b-90c4-0310-8c96-b1721e28e2e2

jun66j5/trac-ja,jun66j5/trac-ja,netjunki/trac-Pygit2,jun66j5/trac-ja,jun66j5/trac-ja,walty8/trac,walty8/trac,netjunki/trac-Pygit2,walty8/trac,netjunki/trac-Pygit2,walty8/trac