fix the build failed bug

@@ -605,7 +605,7 @@ function apply_user_presets() {
         SRS_HTTP_API=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
-        SRS_UTEST=NO
+        SRS_UTEST=YES
         SRS_GPERF=NO
         SRS_GPERF_MC=NO
         SRS_GPERF_MP=NO

@@ -436,7 +436,6 @@ SrsConfDirective* SrsConfDirective::copy()
     cp->conf_line = conf_line;
     cp->name = name;
     cp->args = args;
-    cp->create_time = create_time;
 
     for (int i = 0; i < (int)directives.size(); i++) {
         SrsConfDirective* directive = directives.at(i);

@@ -190,6 +190,10 @@ private:
     */
     virtual int parse_conf(_srs_internal::SrsConfigBuffer* buffer, SrsDirectiveType type);
     /**
+     * deep copy the directive.
+     */
+    virtual SrsConfDirective* copy();
+    /**
     * read a token from buffer.
     * a token, is the directive args and a flag indicates whether has child-directives.
     * @param args, the output directive args, the first is the directive name, left is the args.