* src/gpgme.c (gpgme_set_ctx_flag): Add flags "include-key-block" and
"auto-key-import".
(gpgme_get_ctx_flag): Ditto.
* src/context.h (struct gpgme_context): Add flags include_key_block
and auto_key_import.
* src/engine-gpg.c (struct engine_gpg): Likewise.
(gpg_set_engine_flags): Set the flags for gpg versions >= 2.2.20.
(gpg_decrypt): Set option according to the new flags.
(gpg_encrypt): Ditto.
(gpg_encrypt_sign): Ditto.
(gpg_sign): Ditto.
(gpg_verify): Ditto.