pgsql: pgcrypto update: * openssl.c: Add 3des and AES support *

Log Message:
-----------
pgcrypto update:

* openssl.c: Add 3des and AES support
* README.pgcrypto: list only supported ciphers for openssl

OpenSSL has pre-processor symbol OPENSSL_NO_AES, which
isn't that helpful for detecting if it _does_ exist.
Thus the hack with AES_ENCRYPT.

Marko Kreen

Modified Files:
--------------
pgsql/contrib/pgcrypto:
README.pgcrypto (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/README.pgcrypto.diff?r1=1.8&r2=1.9)
openssl.c (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/openssl.c.diff?r1=1.16&r2=1.17)