Schannel CURLOPT_CERTINFO support.

[marcosdiazr]

Support CURLOPT_CERTINFO for WinSSL (Currently it only shows one certificate)

[bagder]

./vtls/schannel.c:1150:88: warning: Longer than 79 columns (LONGLINE)
 static bool cert_counter_callback(const CERT_CONTEXT *ccert_context, void *certs_count)
./vtls/schannel.c:1153:11: warning: no space before asterisk (ASTERISKNOSPACE)
     (*(int*)certs_count)++;
           ^

[bagder]

Thanks!