Critical Patch for those using the L option on Dial()

http://bugs.digium.com/view.php?id=4760
>
> If you use the L() option on dial and say the latest CVS-HEAD in the
> past month you're potentially getting screwed out of a lot of money.
>
> We originally wrote the L() option for dial and it worked great till
> someone came along and hijacked the timer for something else thus
> causing the L option to fail/reset the timer to zero thus causing it
> to never timeout if someone were to say press a DTMF digit.
>
> So if you use this please test this and report back to the bug ASAP.
>
> Thanks,
> Brian West