include: Rename vkLayer.h -> vk_layer.h and vkIcd.h -> vk_icd.h
diff --git a/icd/nulldrv/nulldrv.h b/icd/nulldrv/nulldrv.h
index 6f3158c..9931b39 100644
--- a/icd/nulldrv/nulldrv.h
+++ b/icd/nulldrv/nulldrv.h
@@ -32,7 +32,7 @@
 
 #include <vulkan.h>
 #include <vk_debug_report_lunarg.h>
-#include <vkIcd.h>
+#include <vk_icd.h>
 #include <vk_wsi_lunarg.h>
 
 #include "icd.h"