openssl: make certinfo available for QUIC

Curl_get_certchain() is now an exported function in lib/vtls/openssl.c that
can also be used from quiche.c and ngtcp2.c to get the certain for QUIC
connections as well.

The *certchain function was moved to the top of the file for this reason.

Reported-by: Eloy Degen
Fixes #9584

lib/vquic/ngtcp2.c

@@ -1703,6 +1703,11 @@ static CURLcode ng_has_connected(struct Curl_easy *data,
   }
   else
     infof(data, "Skipped certificate verification");
+#ifdef USE_OPENSSL
+  if(data->set.ssl.certinfo)
+    /* asked to gather certificate info */
+    (void)Curl_get_certchain(data, qs->ssl);
+#endif
   return result;
 }
 

lib/vquic/quiche.c

@@ -416,6 +416,10 @@ static CURLcode quiche_has_connected(struct Curl_easy *data,
     qs->cfg = NULL;
     qs->conn = NULL;
   }
+  if(data->set.ssl.certinfo)
+    /* asked to gather certificate info */
+    (void)Curl_get_certchain(data, qs->ssl);
+
   return CURLE_OK;
   fail:
   quiche_h3_config_free(qs->h3config);