Disable Seccomp when running old Linux kernel

for those of us running i.e. a 2.x kernel with 3.x headers, for some reason
Good thought, can you scrub the name though so that it doesn't erroneously skip on my machine?
```
> var Os = require('os');
undefined
> Os.release()
'3.13.0-29-generic'
> Os.release() < "3.5"
true
> 
```

This should work:
var releaseNum = Number(release.replace(/^([0-9]+\.[0-9]+).*$/, function (all, capA) { return capA; });
if (Number.isNaN(releaseNum)) { throw new Error("Could not parse kernel version [" + release + "]"); }