[Toybox] [PATCH] tar: add -I (--use-compress-program) support.

[enh]

This also changes the other compression options (such as -j) so that we
pass no arguments for compression and just -d for decompression, which
is what -I does to its filter and which appears sufficient. (I think I
used -dc before just out of habit, since that's what I've been typing on
the command line for decades.)
---
 tests/tar.test   |  7 +++++++
 toys/posix/tar.c | 21 +++++++++++----------
 2 files changed, 18 insertions(+), 10 deletions(-)
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