build: Change SWDB tag "gnupg21" to "gnupg22".
* configure.ac (GNUPG_SWDB_TAG): New ac_define. Set it to "gnupg22". * tools/gpgconf.c (query_swdb): Use it. * build-aux/speedo.mk: Change tag "gnupg21" to "gnupg22". * Makefile.am (distcheck-hook): Ditto.
- Signed-off-by: Werner Koch <wk@gnupg.org>