Merge powerpc grub-mkrescue flavour with common. Use xorriso HFS+

feature for it.

grub-core/video/video.c

@@ -711,3 +711,11 @@ grub_video_set_mode (const char *modestring,
   return grub_error (GRUB_ERR_BAD_ARGUMENT,
 		     N_("no suitable video mode found"));
 }
+
+#ifdef GRUB_UTIL
+void
+grub_video_set_adapter (grub_video_adapter_t adapter)
+{
+  grub_video_adapter_active = adapter;
+}
+#endif