This includes wsutil/file_util.h, which includes io.h, so we don't need
to include it ourselves.
Change-Id: I96b111d2b5a4f27895c1e4b19c31eee2a4d5d554
Reviewed-on: https://code.wireshark.org/review/11595
Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>