* Updated "evhtp" restconf mode

* No reliance on libevent or libevhtp, but on libssl >= 1.1 directly
    * Moved out event handling to clixon event handling
    * Moved out all ssl calls to clixon
  * New code MUST use libevhtp from https://github.com/clixon/clixon-libevhtp.git
    * This does NOT work: libevhtp from https://github.com/criticalstack/libevhtp.git

apps/restconf/restconf_err.c

@@ -36,6 +36,10 @@
   * @see RFC 7231 Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
  */
 
+#ifdef HAVE_CONFIG_H
+#include "clixon_config.h" /* generated by config & autoconf */
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>