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)