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32d202b7 - po: Add a copyright and license notice to the Rules-quot auxiliary files.

po: Add a copyright and license notice to the Rules-quot auxiliary files. Reported by Joël Krähemann <jkraehemann@gmail.com> at <https://savannah.gnu.org/bugs/?57973>. * gettext-runtime/po/quot.sed: Add a copyright and all-permissive license notice. * gettext-runtime/po/boldquot.sed: Likewise. * gettext-runtime/po/en@quot.header: Likewise. * gettext-runtime/po/en@boldquot.header: Likewise. * gettext-runtime/po/insert-header.sed: Use an all-permissive license notice. * gettext-runtime/po/Rules-quot: Likewise. (.insert-header.po-update-en): After running the *.insert-header script, eliminate lines that start with %%.