Patch for Review: Thread.interrupt() for MinGW

[Mohan Embar]

Hi Bryce,

>That's good enough for me. Ranjit and Adam havn't spoken up so please 
>go ahead and check this patch in.

It's in! (I changed the name to _Jv_Win32GetInterruptEvent, rebuilt, retested.)

My patch backlog is empty again, so I'll put out a celebratory 3.4 build this
weekend.

Thanks for all your help.

-- Mohan
http://www.thisiscool.com/
http://www.animalsong.org/