setup: Fix for file names containing colons

[Jon Turney]

On 25/09/2015 15:27, Ken Brown wrote:
> In case this got lost in the thread about font reorganization, I'm
> attaching the patch I proposed in
>
>    https://cygwin.com/ml/cygwin/2015-09/msg00223.html

Ken,

Thanks very much for this patch.  I think it is correct.

This issue didn't show up in my testing as I have the terminus-fonts 
package installed, which explicitly creates the /etc/X11/fontpath.d 
directory.