core: Extend gpgme_subkey_t to carry the keygrip.
* src/gpgme.h.in (struct _gpgme_subkey): Add file 'keygrip'. * src/key.c (gpgme_key_unref): Free KEYGRIP. * src/keylist.c (keylist_colon_handler): Parse GRP records. * src/engine-gpg.c (gpg_keylist_build_options): Do not use --with-fingerprint options for gpg versions >= 2.1.15. * tests/run-keylist.c (main): Print subkeys and keygrips.
- Signed-off-by: Werner Koch <wk@gnupg.org>