stat: fix macOS build and behavior.

My patch to fix df behavior on macOS broke the stat build on macOS.

First off, we had %s and %S the wrong way round compared to coreutils,
though since Linux always seems to use the same value for both,
no-one will ever have noticed.

Annoyingly, Linux and macOS disagree about what statfs::f_bsize
means, and whether statfs::f_iosize and statfs::f_frsize exist (each
has one or the other, depending on what f_bsize *doesn't* mean to
them). This mess is presumably why statvfs exists.

Unfortunately, statvfs on macOS at least doesn't contain the file
system type information.  So we either need to do *both* statfs()
and statvfs() for macOS, or we need to take into account the different
fields.

This patch adds an #ifdef outside of portability.h because I wasn't
sure we actually wanted to add statfs_best_transfer_size() and
statfs_real_block_size() functions to lib for this. But that's an
easy cleanup if desired.

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