Omit copy to RAM when possible with VAAPI

sunshine/platform/linux/vaapi.h

@@ -1,9 +1,15 @@
-#ifndef SUNSHINE_DISPLAY_H
-#define SUNSHINE_DISPLAY_H
+#ifndef SUNSHINE_VAAPI_H
+#define SUNSHINE_VAAPI_H
 
+#include "misc.h"
 #include "sunshine/platform/common.h"
+
+namespace egl {
+struct surface_descriptor_t;
+}
 namespace va {
 std::shared_ptr<platf::hwdevice_t> make_hwdevice(int width, int height);
+std::shared_ptr<platf::hwdevice_t> make_hwdevice(int width, int height, file_t &&card, int offset_x, int offset_y, const egl::surface_descriptor_t &sd);
 
 int init();
 } // namespace va