pkcs15-dnie: fix compilation when OpenSSL is not used

If OpenSSL is not used then the functions from card-dnie.c are not
defined and in particular dnie_match_card() is not defined.
In that case we use a fake dnie_match_card() that just returns false.
build: disable Secure Messaging if OpenSSL is not used

If OpenSSL is not present or --disable-openssl then Secure Messaging is
disabled.

The problem was that some Secure Messaging code is missing if OpenSSL is
absent. The build/link failed with some missing symbols.

Fix issue #293
Fix compiler warning

pkcs15-dnie.c:242:13: warning: function declaration isn't a prototype [-Wstrict-prototypes]
 const char *sc_driver_version()
             ^
Fix compiler warning

p15card-helper.c:23:5: warning: 'ENABLE_OPENSSL' is not defined, evaluates to 0
      [-Wundef]
    ^