Back port patch.

Call srandom() instead of srand().
pgbench calls random() later, so it should have called srandom().
On most platforms except Windows srandom() is actually identical
to srand(), so the bug only bites Windows users.
per bug report from Akio Ishida.

contrib/pgbench/pgbench.c

@@ -1,5 +1,5 @@
 /*
- * $Header: /cvsroot/pgsql/contrib/pgbench/pgbench.c,v 1.27.2.2 2003/12/07 19:56:07 tgl Exp $
+ * $Header: /cvsroot/pgsql/contrib/pgbench/pgbench.c,v 1.27.2.3 2007/01/13 03:24:55 ishii Exp $
  *
  * pgbench: a simple TPC-B like benchmark program for PostgreSQL
  * written by Tatsuo Ishii
@@ -935,7 +935,7 @@ main(int argc, char **argv)
 
 	/* set random seed */
 	gettimeofday(&tv1, 0);
-	srand((uint) tv1.tv_usec);
+	srandom((uint) tv1.tv_usec);
 
 	/* get start up time */
 	gettimeofday(&tv1, 0);