Update GnuPG to 2.1.17 which resolves the following error that resulted when
attempting to use the --export-ssh-key option.

gpg: Ohhhh jeeee: Assertion "ret_found_key == NULL || ret_keyblock != NULL" in
lookup failed (getkey.c:3677)

The KDNS option is removed with this update because upstream dropped use of
adns in favor of a bundled libdns which is used by default. Also, removed an
obsolete patch.

PR: 216057
Submitted by: Matthew Rezny