cleanup: windows: convert argv (UCS-2 to UTF-8) at earliest

cleanup: windows: convert argv (UCS-2 to UTF-8) at earliest

Discussed at [1].

Use wmain under windows, drop the custom parsing and shell32 linkage.

There is no need for gc magic as this allocation is static.

[1] http://permalink.gmane.org/gmane.network.openvpn.devel/5433

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Message-Id: 1332621070-28464-1-git-send-email-alon.barlev@gmail.com
URL: http://article.gmane.org/gmane.network.openvpn.devel/6063
Tested-by: Samuli Seppänen <samuli@openvpn.net>
Signed-off-by: David Sommerseth <davids@redhat.com>