Upgrade to newer help2man.
Reported by Bernhard M. Wiedemann in <https://savannah.gnu.org/bugs/?54367>.
* gettext-runtime/man/help2man: Upgrade to version 1.47.6, with one change:
$source ||= "$program $version";
replaced by
$source ||= "$package $version";
* gettext-tools/man/help2man: Likewise.
