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/expected/init.out

@@ -8,6 +8,8 @@
 SET client_min_messages = warning;
 \set ECHO none
 RESET client_min_messages;
+-- ensure consistent test output regardless of the default bytea format
+SET bytea_output TO escape;
 -- check for encoding fn's
 SELECT encode('foo', 'hex');
  encode