[Bug win32/14529] Make gdb capable of JIT-debugging on W32

[Eli Zaretskii]

> From: LRN <lrn1986@gmail.com>
> Date: Thu, 30 Jun 2016 16:16:40 +0300
> 
> I did the paperwork and now my rights on code that will be included in gdb
> are assigned to FSF.
> So i'm upping the thread. Also, attaching a version of the patch that can
> be applied to current git master.

Thanks.  The documentation change is approved, but please include a
NEWS entry, and also please show the ChangeLog entries for the
changes.