ipkg-build: suppress timestamps in gzip headers
When creating control.tar.gz, data.tar.gz and $package.ipk tar compresses them with default gzip options. This includes build timestamps in their gzip headers. By setting the GZIP env variable to -n, gzip no longer embeds them, which is a step towards reproducibility. See also [1] for more detailed motivations. [1]: https://wiki.debian.org/ReproducibleBuilds/About Signed-off-by: Reiner Herrmann <reiner@reiner-h.de> SVN-Revision: 46026v19.07.3_mercusys_ac12_duma
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