bug#18302: MSYS2 build issues

[Glenn Morris]

Eli Zaretskii wrote:

> not sure we should be changing it.  In particular, I'm not sure
> non-GNU 'ln' supports these 2 switches (and why do you need -v
> anyway?).

http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Limitations-of-Usual-Tools.html

   "Don't rely on ln having a -f option."

This and other changes that you commented on give the strong impression
that this patch contains a bunch of things that are just personal
preferences.