LibVirtGPU: Add a new GPU device that talks to our VirtIO-GPU driver

At this moment this only contains function stubs.

Userland/Libraries/LibVirtGPU/Shader.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibVirtGPU/Shader.h>
+
+namespace VirtGPU {
+
+Shader::Shader(void const* ownership_token)
+    : GPU::Shader(ownership_token)
+{
+}
+
+}