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2899ed44 - po: Sync gettext-tools/po/Makevars with gettext-runtime/po/Makevars

po: Sync gettext-tools/po/Makevars with gettext-runtime/po/Makevars * Makevars (PACKAGE_GNU, PO_DEPENDS_ON_POT) (DIST_DEPENDS_ON_UPDATE_PO): New variables. * Makevars.template (PACKAGE_GNU, PO_DEPENDS_ON_POT) (DIST_DEPENDS_ON_UPDATE_PO): New variables.