cygport: Request a new feature in order to set owner/group names in packaged tarballs.

[Achim Gratz]

Lemures Lemniscati via Cygwin-apps writes:
> [1]: https://github.com/cygwin-lem/cygport/commit/7ae236b524fa5f5b27f9773cdf21ee4f6624a53b

You set the variable CYGPORT_TAR_EXT in pkg_pkg.cygpart, then use it in
pkg_upload-cygport.  Have you verified tha the latter will have that
definition included regardless of the code path taken?


Regards,
Achim.
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