pgsql: pgcrypto update: * Use error codes instead of -1 * px_strerror

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

* Use error codes instead of -1
* px_strerror for new error codes
* calling convention change for px_gen_salt - return error code
* use px_strerror in pgcrypto.c

Marko Kreen

Modified Files:
--------------
    pgsql/contrib/pgcrypto:
        internal.c (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/internal.c.diff?r1=1.15&r2=1.16)
        openssl.c (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/openssl.c.diff?r1=1.15&r2=1.16)
        pgcrypto.c (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/pgcrypto.c.diff?r1=1.17&r2=1.18)
        px-crypt.c (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/px-crypt.c.diff?r1=1.9&r2=1.10)
        px-crypt.h (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/px-crypt.h.diff?r1=1.6&r2=1.7)
        px-hmac.c (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/px-hmac.c.diff?r1=1.5&r2=1.6)
        px.c (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/px.c.diff?r1=1.9&r2=1.10)
        px.h (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/px.h.diff?r1=1.10&r2=1.11)
        random.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/random.c.diff?r1=1.8&r2=1.9)