ExtUtils::MM_Any: Get rid of unused printf arguments in dir_target

These printf arguments have been in flux since 0f2e87e, but although we
had 6 at that point they were quickly chopped down to 4 in 2f9a3b6 and
have remained at that number ever since.

Change the code not to provide redundant arguments that it doesn't have
to. Found with a nascent patch of mine to the core to detect redundant
printf arguments: https://rt.perl.org/Public/Bug/Display.html?id=121025
Merge pull request #84 from avar/avar/remove-redundant-printf-arguments

ExtUtils::MM_Any: Get rid of unused printf arguments in dir_target