vulkan: add VK_ANDROID_native_buffer to vulkan.api

Change-Id: I5d90918b10264b9d2cf8b73dc7a7c983b6721862
diff --git a/vulkan/api/platform.api b/vulkan/api/platform.api
index 980722d..7aa19e7 100644
--- a/vulkan/api/platform.api
+++ b/vulkan/api/platform.api
@@ -43,6 +43,7 @@
 
 // VK_USE_PLATFORM_ANDROID_KHR
 @internal class ANativeWindow {}
+@internal type void* buffer_handle_t
 
 // VK_USE_PLATFORM_WIN32_KHR
 @internal type void* HINSTANCE