cryptoapi.c: remove pre OpenSSL-3.01 support

cryptoapi.c: remove pre OpenSSL-3.01 support

- Require xkey-provider (thus OpenSSL 3.01+) for --cryptoapicert

Note:
  Ideally we should also make ENABLE_CRYPTOAPI conditional
  on HAVE_XKEY_PROVIDER but that looks hard unless we can agree
  to move HAVE_XKEY_PROVIDER to configure/config.h.

v2: use "binary" instead of "version" in the error message

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230201230340.2268781-1-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26131.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>