Move cookie callbacks implementation to own module
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 67661ea..3186acc 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -81,6 +81,10 @@
 #include "polarssl/ssl_cache.h"
 #endif
 
+#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
+#include "polarssl/ssl_cookie.h"
+#endif
+
 #if defined(POLARSSL_MEMORY_BUFFER_ALLOC_C)
 #include "polarssl/memory.h"
 #endif