misc: Update to header version 1.0.6

Change-Id: Idf7a9d40278b796e16effa54e9b60668d275b8ec
diff --git a/layers/unique_objects.h b/layers/unique_objects.h
index 4200844..b8effcf 100644
--- a/layers/unique_objects.h
+++ b/layers/unique_objects.h
@@ -43,6 +43,7 @@
 #include "vk_layer_logging.h"
 #include "vk_layer_extension_utils.h"
 #include "vk_safe_struct.h"
+#include "vk_layer_utils.h"
 
 struct layer_data {
     bool wsi_enabled;