utils: include config.h

src/utils.cpp

@@ -16,6 +16,10 @@
  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "utils.h"
 #include "sockaddr.h"
 #include "default_types.h"