Override atime and ctime in tar PaxHeaders
Override atime and ctime in tar PaxHeaders to make build results deterministic
See https://reproducible-builds.org/ for why this is good.
related to https://phabricator.kde.org/D25494
Without this patch, openSUSE's kio
package varied in
/usr/share/kdevappwizard/templates/ioslave.tar
This PR was done while working on reproducible builds for openSUSE.