Remove dead stuff from pgcrypto.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: b2cc748b09456ea24cdd00a7691ce33db9a1af45
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2016-11-30T11:04:16Z
Releases: 10.0
Remove dead stuff from pgcrypto.

pgp-pubkey-DISABLED test has been unused since 2006, when support for
built-in bignum math was added (commit 1abf76e8). pgp-encrypt-DISABLED has
been unused forever, AFAICS.

Also remove a couple of unused error codes.

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