Removed a variable that's no longer used (issue #608)

Signed-off-by: Botond Baranyi <botond.baranyi@ericsson.com>

compiler2/ttcn3/Ttcnstuff.cc

@@ -4519,7 +4519,6 @@ namespace Ttcn {
 
     string header_name;
     string source_name;
-    string base_header_include;
     if (output_dir != NULL) {
       header_name = string(output_dir) + string("/");
       source_name = string(output_dir) + string("/");
@@ -4527,13 +4526,6 @@ namespace Ttcn {
     header_name += file_prefix + string(".hh");
     source_name += file_prefix + string(".cc");
 
-    if (base_class != NULL && base_class->external) {
-      base_header_include = string("#include \"");
-      base_header_include += duplicate_underscores ? base_class->class_id->get_name() :
-          base_class->class_id->get_dispname();
-      base_header_include += string(".hh\"\n\n");
-    }
-
     char* user_info = NULL;
     if (disable_user_info == FALSE) {
       user_info = get_user_info();