[Toybox] [PATCH] tar: use same tools for decompression as for compression.

[enh]

This is what GNU tar does, so Android's build system jail allows
bzip2, gzip, and xz, but not bzcat, zcat, and xzcat.

Why the function? Because auto-detection works by setting toyflags, so
we need to make sure we test the flags late, so it's either two copies
of this or a function.
---
 toys/posix/tar.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)
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