getInfo() returns undefined on Raspbian (Ubuntu) on Raspberry Pi

Testing with node v0.10.36 at the moment, but I'll also try on io.js v1.2.0 (once fixes for armv6 support are merged back in).

`test-netroute.js`:

``` javascript
'use strict';

console.log(
require('netroute')
, require('netroute').getInfo()
, require('netroute').getGateway()
);
```

``` bash
node test-netroute.js

/home/pi/holepunch/node_modules/netroute/lib/netroute.js:10
def = info.IPv4.filter(function(route) {
^
TypeError: Cannot read property 'IPv4' of undefined
at Object.getGateway (/home/pi/holepunch/node_modules/netroute/lib/netroute.js:10:13)
at Object. (/home/pi/holepunch/test-netroute.js:6:23)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:929:3
```

Start by reproducing the report with test-netroute.js on Raspbian and inspect lib/netroute.js, especially getInfo() and the getGateway() call at line 10. Trace why the route data is undefined on this platform; done means the reported calls return usable route information without the shown TypeError.

Written by the indexing model from the issue text.