pgsql: Dept of second thoughts: don't expose rijndael.tbl: rijndael.c

Log Message:
-----------
Dept of second thoughts: don't expose rijndael.tbl: rijndael.c dependency
to make.  We ship the table file in the tarball and so this dependency
just opens file timestamp skew problems without doing anything useful.
(Not that it should hurt, either ... except for cross-compile builds.)

Modified Files:
--------------
    pgsql/contrib/pgcrypto:
        Makefile (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/Makefile.diff?r1=1.15&r2=1.16)