bug#14513: 24.3.50; Site load-path pieces differ in MSYS build

[Eli Zaretskii]

> From: Achim Gratz <Stromeko@nexgo.de>
> Date: Fri, 31 May 2013 21:01:32 +0200
> 
> If this is at least documented clearly

I added a description of the new tree to etc/NEWS.

> (not just that this change is made, but _how_ to install things
> differently now)

Not sure what this means.  Please take a look at the text I wrote, and
if you have further suggestions, please speak up.