vtls: make BearSSL possible to set with CURL_SSL_BACKEND

Ref: https://github.com/curl/curl/commit/9b879160df01e7ddbb4770904391d3b74114302b#commitcomment-36355622

Closes #4698

diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 894fd8a43bda168bd30fd20d55f9f8b2c68abd76..c493b151698d15846a4b05955c78d04e88a3a616 100644 (file)
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -1225,6 +1225,9 @@ static const struct Curl_ssl *available_backends[] = {
 #endif
 #if defined(USE_MESALINK)
   &Curl_ssl_mesalink,
+#endif
+#if defined(USE_BEARSSL)
+  &Curl_ssl_bearssl,
 #endif
   NULL
 };