[Toybox] [PATCH] file, stat: various small improvements.

[enh]

file now shows the target of a symbolic link and calls out broken
symbolic links.

file now shows the device type for block/character special files.

file now shows specific reason when it can't open.

stat now includes the device type, plus a little more space between the
number of blocks and the human-readable file type.

Adjusted tests accordingly, which actually makes more of them pass on
the host as a convenient side-effect, but I actually made these changes
because I've been finding the desktop file and stat output more convenient
in these cases.
---
 tests/file.test   | 10 +++++++---
 toys/other/stat.c |  4 ++--
 toys/posix/file.c | 20 +++++++++++++-------
 3 files changed, 22 insertions(+), 12 deletions(-)
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