distribute should be explicit about encoding for egg-info metadata file

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Issue #265 new
Carl Meyer created an issue

See https://github.com/pypa/virtualenv/issues/201#issuecomment-3145690 - since distribute does not specify an explicit encoding, the user's locale is used. If that is an ASCII locale, any non-ASCII characters in e.g. long-description will cause a crash on install.

UTF-8 would be the obvious choice for an explicit encoding.