See if yhis fixes "cast discards '__attribute__((const))' qualifier from
pointer target type"

Change-Id: I0f97b119f1e6151622d360464f12ad399cbaf117
Reviewed-on: https://code.wireshark.org/review/2917
Tested-by: Anders Broman <a.broman58@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>