{patch bfd/ld/binutils]: Adjust calling convention of x64 windows to non-leading underscore

[Nick Clifton]

Hi Kai,

> the configure option '--enable-leading-mingw64-underscores' is
> something for bfd. But you are right, that a NEWS entry should be
> written for it, but is ld the correct place for this?

There is no bfd/NEWS file so I felt that ld/NEWS would be the next best 
place for this announcement.

Cheers
   Nick