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

[enh]

Used by build/make/tools/mktarball.sh in AOSP. (Which is why today's
switch to toybox tar got reverted.)
---
 tests/tar.test   |  4 ++++
 toys/posix/tar.c | 13 ++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)
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