* src/gpgme.h.in (struct _gpgme_subkey): New flag subkey_match.
* src/keylist.c (spacep): New.
(op_data_t): Add field requested_subkey.
(release_op_data): Free it.
(exact_match_pattern): New.
(maybe_setup_for_requested_subkey): New.
(gpgme_op_keylist_start): Call it here.
(gpgme_op_keylist_ext_start): Call it for each pattern until one
found.
(gpgme_op_keylist_next): Set the subkey_match field.
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