gpgconf: Fix some warnings.
* tests/gpg/t-gpgconf.c (main): Fix warnings. * src/engine-gpgconf.c (struct gpgconf_config_dir_s): New struct. (gpgconf_config_dir_cb, gpgconf_conf_dir) Use it to fix warning.
- Signed-off-by: Marcus Brinkmann <mb@g10code.com>