Merge pull request #9344 from liamwhite/null

video_core: add null backend

src/yuzu/bootmanager.h

@@ -219,6 +219,7 @@ private:
 
     bool InitializeOpenGL();
     bool InitializeVulkan();
+    void InitializeNull();
     bool LoadOpenGL();
     QStringList GetUnsupportedGLExtensions() const;