vtls: use unified "supports" bitfield member in backends

... instead of previous separate struct fields, to make it easier to
extend and change individual backends without having to modify them all.

closes #2547

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index eb1fc2220..38f08b3c6 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2740,7 +2740,7 @@ static CURLcode parse_proxy(struct Curl_easy *data,
     proxyptr = proxy; /* No xxx:// head: It's a HTTP proxy */
 
 #ifdef USE_SSL
-  if(!Curl_ssl->support_https_proxy)
+  if(!(Curl_ssl->supports & SSLSUPP_HTTPS_PROXY))
 #endif
     if(proxytype == CURLPROXY_HTTPS) {
       failf(data, "Unsupported proxy \'%s\', libcurl is built without the "