gettext

212709aa - Update after release 0.21.1 has been prepared on the branch.

Update after release 0.21.1 has been prepared on the branch. * NEWS: Update. * gettext-runtime/m4/gettext.m4: Bump release version and year. * gettext-runtime/m4/intl.m4: Likewise. * gettext-runtime/m4/po.m4: Bump year.