ackages: add pyrrd (an Object-Oriented Python Interface for RRDTool)

This patch is a port of the PyRRD package to openwrt. PyRRD is a wrapper
for rrdtool for python. The API is so much better than the python
bindings for rrd.

Signed-off-by: Roberto Riggio <roberto.riggio@create-net.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@29402 3c298f89-4303-0410-b956-a3cf2f4a3e73

lang/pyrrd/patches/101-cross.patch

@@ -0,0 +1,10 @@
+--- a/setup.py
++++ b/setup.py
+@@ -1,4 +1,6 @@
+-from setuptools import setup
++#!/usr/bin/env python
++
++from distutils.core import setup
+ 
+ from pyrrd import meta
+ from pyrrd.util import dist