headers: Add vk_sdk_platform.h for Win/Linux differences
diff --git a/tests/test_common.h b/tests/test_common.h
index fe59415..2fccbd5 100644
--- a/tests/test_common.h
+++ b/tests/test_common.h
@@ -8,6 +8,7 @@
 #include <assert.h>
 
 #include <vulkan.h>
+#include <vk_sdk_platform.h>
 
 #include "gtest/gtest.h"
 #include "gtest-1.7.0/include/gtest/gtest.h"