extdiff, double line feed on windows

[Alexis S. L. Carvalho]

Thus spake Darrell Gallion:
> Replaced all instances of:
>    open(dest,'w')
> with:
>    open(dest, 'wb')
> 
> 
> This fixed the double line feeds.

I've pushed a fix to the crew-stable repo.

Thanks for reporting this.

Alexis