I believe you'll avoid such FAIL reports if, in your Makefile.PL you replace:

use File::Util;
[download]

with

eval {require File::Util;};
exit if $@;
[download]

That way, if File::Util is not installed, the build process simply stops - and no FAIL is either recorded or sent. (You'd probably want to provide a message prior to the exit - so that the user knows why the process is stopping.)

There might now exist a better solution, btw.

Cheers,
Rob