Add CVE-2014-4971 BthPan local privilege escalation

Add CVE-2014-4971 BthPan local privilege escalation for Windows XP SP3.

This module incorporates the feedback we have gotten so far on pull request 3534 for a different module; if there is more, we will update this code accordingly as well.
Could we refactor this nested condition to something like:
```
if drvname == current_drvname || current_drvname.downcase.include?('krnl')
    return [address, current_drvname]
end
```
Is that functionally equivalent?