Ooops, missed that a couple of contrib modules have calls to byteacmp.

Add bytea.h inclusions as needed.  Some of the contrib regression tests
need to be de-hexified, too.  Per buildfarm.

contrib/pgcrypto/sql/pgp-encrypt.sql

@@ -1,6 +1,8 @@
 --
 -- PGP encrypt
 --
+-- ensure consistent test output regardless of the default bytea format
+SET bytea_output TO escape;
 
 select pgp_sym_decrypt(pgp_sym_encrypt('Secret.', 'key'), 'key');