Update ruby-net-http-persistent to 2.6.

=== 2.6 / 2010-03-26

* Minor enhancement
  * Net::HTTP::Persistent#idle_timeout may be set to nil to disable expiration
    of connections.  Pull Request #21 by Aaron Stone

www/ruby-net-http-persistent/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.4 2012/02/28 20:38:51 minskim Exp $
+# $NetBSD: Makefile,v 1.5 2012/04/29 15:50:51 taca Exp $
 
-DISTNAME=	net-http-persistent-2.5.2
+DISTNAME=	net-http-persistent-2.6
 CATEGORIES=	www
 
 MAINTAINER=	[email protected]

www/ruby-net-http-persistent/distinfo

@@ -1,5 +1,5 @@
-$NetBSD: distinfo,v 1.4 2012/02/28 20:38:51 minskim Exp $
+$NetBSD: distinfo,v 1.5 2012/04/29 15:50:51 taca Exp $
 
-SHA1 (net-http-persistent-2.5.2.gem) = bd4d93a01e4e40b5ca864200329c4186a6d2aaa3
-RMD160 (net-http-persistent-2.5.2.gem) = 939683244a7a3b9111a35c897720d7d32fb12cf0
-Size (net-http-persistent-2.5.2.gem) = 24576 bytes
+SHA1 (net-http-persistent-2.6.gem) = 643a737fcd416549a215ac1e5ffbb1b89a14b9a4
+RMD160 (net-http-persistent-2.6.gem) = 03605e3d9614657ec66f76f83a646c0c3f3920a1
+Size (net-http-persistent-2.6.gem) = 25088 bytes