Merge branch 'ws/curl-http-proxy-over-https'

Git has been taught to support an https:// URL used for http.proxy
when using recent versions of libcurl.

* ws/curl-http-proxy-over-https:
  http: support CURLPROXY_HTTPS

http.c

@@ -865,6 +865,11 @@ static CURL *get_curl_handle(void)
 		else if (starts_with(curl_http_proxy, "socks"))
 			curl_easy_setopt(result,
 				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
+#endif
+#if LIBCURL_VERSION_NUM >= 0x073400
+		else if (starts_with(curl_http_proxy, "https"))
+			curl_easy_setopt(result,
+				CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
 #endif
 		if (strstr(curl_http_proxy, "://"))
 			credential_from_url(&proxy_auth, curl_http_proxy);