[Toybox] [PATCH] tar: fix base-256 output.

[enh]

A tar file created by toybox tar with values large enough to need
base-256 rather than ASCII octal caused a tar reader to crash, and
caused GNU tar to complain.

I note from the docs at
https://github.com/libarchive/libarchive/blob/master/libarchive/tar.5#L326
that they imply that only the top *bit* should be set to indicate this
format, not the whole top byte, to give a 95-bit or 63-bit field. But I
don't think we can hit that in practice?

Bug: http://b/181683612
---
 tests/tar.test   |  5 +++++
 toys/posix/tar.c | 17 ++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)
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