sysutils/hs-system-fileio: import hs-system-fileio-0.3.16.4

This is a small wrapper around the directory, unix, and Win32 packages, for
use with system-filepath. It provides a consistent API to the various
versions of these packages distributed with different versions of GHC.

In particular, this library supports working with POSIX files that have
paths which can't be decoded in the current locale encoding.

(pho)