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.
If it breaks with `make_nops` then that's cool mate. I just thought I'd ask in case as the bit of randomisation can't be bad.

But yeah, if it breaks, then we'll leave it alone. Cheers for checking!