Remove last rest of INSTALL-win32.txt references

Remove last rest of INSTALL-win32.txt references

Commit 04341beb1d8e0fad3425bfec5f281fe431895cd6 removed the
INSTALL-win32.txt file.  But there were crucial parts left in
Makefile.am which broke building OpenVPN.  In addition, removed
other references in INSTALL and README to the same file to be
complete.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1477586981-5047-1-git-send-email-davids@openvpn.net>
URL: http://www.mail-archive.com/search?l=mid&q=1477586981-5047-1-git-send-email-davids@openvpn.net