gl_rasterizer: implement AccelerateDrawBatch to emulate PICA shader on hardware

src/video_core/rasterizer_interface.h

@@ -66,5 +66,10 @@ public:
                                    ScreenInfo& screen_info) {
         return false;
     }
+
+    /// Attempt to draw using hardware shaders
+    virtual bool AccelerateDrawBatch(bool is_indexed) {
+        return false;
+    }
 };
 } // namespace VideoCore