msvc: better support for 32bit architecture

msvc: better support for 32bit architecture

Previously dependency directory was hardcoded to

..\openvpn-build\msvc\image

which means that to build for 32bit architecture,
one needs to rebuild dependencies and do the same again
for 64bit architecture.

Add architecture's "bitness" to dependency directory.

As a bonus, add missing libraries to 32bit targets.

This requires correspondig change to openvpn-build:

https://github.com/OpenVPN/openvpn-build/pull/190
Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20200914084444.96-1-lstipakov@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg20990.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>