Make tar archives reproducible by setting Pax headers
Summary: When POSIXLY_CORRECT is set, GNU tar will add ctime, atime and the PID of the tar process that created the archive, as pointed out in [1]. To circumvent this, we set the Pax headers manually as recommended, but we only do this when SOURCE_DATE_EPOCH is set, i.e. reproducible builds are desired. [1] https://salsa.debian.org/reproducible-builds/reproducible-website/merge_requests/50/diffs Test Plan: Repeated builds produce the same files now. Changing the input files' timestamps seems without effect. Reviewers: kfunk, #kdevelop, kossebau Reviewed By: #kdevelop, kossebau Differential Revision: https://phabricator.kde.org/D25494
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