core: Extend gpgme_get_dirinfo to return the gpg-wks-client name.
* src/dirinfo.c (WANT_GPG_WKS_CLIENT_NAME): New const. (struct dirinfo): New field 'gpg_wks_client_name'. (get_gpgconf_item): Build it on demand. (gpgme_get_dirinfo): New value "gpg-wks-client-name" for WHAT.
- Signed-off-by: Werner Koch <wk@gnupg.org>