Merge from 0.22.x branch: Prepare for 0.22.4 release.
* gettext-runtime/intl/libgnuintl.in.h (LIBINTL_VERSION): Bump.
* gettext-tools/libgettextpo/gettext-po.in.h (LIBGETTEXTPO_VERSION): Bump.
* libtextstyle/version.sh: Update VERSION_NUMBER, RELEASE_DATE.
* gettext-tools/configure.ac (ARCHIVE_VERSION): Bump to 0.22.3.
* gettext-tools/misc/autopoint.in: Allow version 0.22.3.
