ota(fix): use gnu tar in ubuntu touch and pocketbook

[houqp]

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[KenMaltby]

I am an NRA member, so it doesn't bother me, and I know the work you guys do can be frustrating, at times, but did you mean GNU ?

[Frenzie]

Yes, but unfortunately I only noticed the typo a split second after clicking merge. I didn't give it as much focus as the commands in the commit. :-P

Btw, there's a picture of a guntar here (via)

The typo itself is actually surprisingly rare. I searched for "gun tar" -guns -military -shot -shoot -shooting -foam but it's still showing a lot of noise. Only one result was about GNU Tar, namely and embarrassingly, the typo made it into a published book: Utilizing Open Source Tools for Online Teaching and Learning: Applying Linux. Adding an extract at the end, i.e., "gun tar" -guns -military -shot -shoot -shooting -foam extract helps give you a fair bit of typo results.