libfetch: minor HTTP handling improvement

The recent TCP_CORK change missed this bit of code.  This change
should improve performance a bit when making HTTP requests by calling
http_cmd only once instead of three times.

libfetch/http.c

@@ -711,11 +711,8 @@ http_connect(struct url *URL, struct url *purl, const char *flags, int *cached)
 		/* fetch_connect() has already set an error code */
 		return (NULL);
 	if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) {
-		http_cmd(conn, "CONNECT %s:%d HTTP/1.1\r\n",
-				URL->host, URL->port);
-		http_cmd(conn, "Host: %s:%d\r\n",
-				URL->host, URL->port);
-		http_cmd(conn, "\r\n");
+		http_cmd(conn, "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n\r\n",
+			 URL->host, URL->port, URL->host, URL->port);
 		if (http_get_reply(conn) != HTTP_OK) {
 			http_seterr(conn->err);
 			goto ouch;