misc: Update to header version 1.0.6

Change-Id: Idf7a9d40278b796e16effa54e9b60668d275b8ec
diff --git a/layers/vk_layer_utils.h b/layers/vk_layer_utils.h
index 1dc2e0e..d349ffe 100644
--- a/layers/vk_layer_utils.h
+++ b/layers/vk_layer_utils.h
@@ -40,6 +40,7 @@
 extern "C" {
 #endif
 
+#define VK_LAYER_API_VERSION (VK_VERSION_MAJOR(1) | VK_VERSION_MINOR(0) | VK_VERSION_PATCH(VK_HEADER_VERSION))
 typedef enum VkFormatCompatibilityClass {
     VK_FORMAT_COMPATIBILITY_CLASS_NONE_BIT = 0,
     VK_FORMAT_COMPATIBILITY_CLASS_8_BIT = 1,