headers: Add vk_sdk_platform.h for Win/Linux differences
diff --git a/loader/vk_loader_platform.h b/loader/vk_loader_platform.h
index 41d6d47..9207154 100644
--- a/loader/vk_loader_platform.h
+++ b/loader/vk_loader_platform.h
@@ -32,6 +32,7 @@
 #define LOADER_PLATFORM_H
 
 #include "vk_platform.h"
+#include "vk_sdk_platform.h"
 
 #if defined(__linux__)
 /* Linux-specific common code: */