[Toybox] [PATCH] tar: implement --null.

[enh]

No --no-null because it requires new infrastructure, and doesn't (yet)
have a user.
---
 tests/tar.test   | 8 ++++++++
 toys/posix/tar.c | 8 ++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)
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