Update probe.pm

Using the newer 'make_path' and 'remove_tree' causes build/configure to bail out on older versions of File::Path (especially those shipped with perl v5.10). Please see [File::Path#APIChanges][1]. This should probably be changed to detect versions and cascade accordingly, I got rakudo built with this simple fix. 

[1]: https://metacpan.org/pod/File::Path#API-CHANGES