Change the "N. Central Asia Standard Time" timezone to map to

Asia/Novosibirsk on Windows.

Microsoft changed the behaviour of this zone in the timezone update
from KB976098. The zones differ in handling of DST, and the old
zone was just removed.

Noted by Dmitry Funk

src/timezone/pgtz.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.58.2.5 2010/04/09 11:49:58 mha Exp $
+ *	  $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.58.2.6 2010/05/20 14:13:20 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -888,8 +888,8 @@ static const struct
 	},							/* (GMT+06:30) Rangoon */
 	{
 		"N. Central Asia Standard Time", "N. Central Asia Daylight Time",
-		"Asia/Almaty"
-	},							/* (GMT+06:00) Almaty, Novosibirsk */
+		"Asia/Novosibirsk"
+	},							/* (GMT+06:00) Novosibirsk */
 	{
 		"Namibia Standard Time", "Namibia Daylight Time",
 		"Africa/Windhoek"