Make cert_data.h and test_cryptoapi/pkcs11.c MSVC compliant

Make cert_data.h and test_cryptoapi/pkcs11.c MSVC compliant

- Do not use non-literal initializers for static objects
- Replace empty initializer {} by {0}

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Co-authored-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20230327114937.28246-1-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26525.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>