Fixed warnings in the Vulkan project

src/Device/Surface.hpp

@@ -315,7 +315,7 @@ namespace sw
 		LOCK_UPDATE   // Write access which doesn't dirty the buffer, because it's being updated with the sibling's data.
 	};
 
-	class [[clang::lto_visibility_public]] Surface
+	class Surface
 	{
 	private:
 		struct Buffer

src/WSI/FrameBuffer.hpp

@@ -37,7 +37,7 @@ namespace sw
 		int cursorHeight;
 	};
 
-	class [[clang::lto_visibility_public]] FrameBuffer
+	class FrameBuffer
 	{
 	public:
 		FrameBuffer(int width, int height, bool fullscreen, bool topLeftOrigin);