Delete old sample-windows file and obsolete Windows sample handling

Delete old sample-windows file and obsolete Windows sample handling

This file is apparently over 20 years old and
was never updated besides fixing some obvious
syntax errors with new versions.

So let's just get rid of it. AFAICT the Windows
installer does not use it. Only the
{server,client}.ovpn. And even there, it just uses
the files directly from the build directory and
does not depend on us renaming them (which is
obvious since we do not use the Makefile at all
in the Windows build, only CMake).

Github: Closes OpenVPN/openvpn#758
Change-Id: I15c730c9eb3f1338019577e7c665c0ca5b1edcd4
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20250602153900.29646-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31850.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>