test: iosvlc: handle asset:// scheme by redirecting to the bundle
asset:// scheme will be redirected to file:// access with the correct bundle path setup as prefix, so that any asset:// resource is accessed from the application package directly.
With EXTRA_FILE=sample.mp4 ../extras/package/apple/bundle.sh, it
provides the ability to play the file by running the application with
the argument asset://sample.mp4
.