vcpkg-ports/pkcs11-helper: support loader flags

vcpkg-ports/pkcs11-helper: support loader flags

Add dynamic loader flag feature to bundled pkcs11-helper.
Required to allow special handling for PKCS11 providers on win32.

Signed-off-by: Marc Becker <marc.becker@astos.de>
Acked-by: Lev Stipakov <lstipakov@gmail.com>
Message-Id: <20221214143325.2604-1-marc.becker@astos.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25691.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 2f9c56e2cb0ce0f8d7a2a30f89831d1ddc0f2bbb)