zstd: update to 1.4.8

[r-ricci]

No description provided.

[r-ricci]

do_check() is failing on the (i686, i686, 1) build. I tested locally on x86_64-glibc with a i686 masterdir, but I cannot reproduce the failure.

EDIT: I forgot to checkout the right branch. I can reproduce, but I don't know what is the problem.

[pullmoll]

The check prints the problem:

zstd: util.c:351: readLinesFromFile: Assertion `pos + lineLength < dstCapacity' failed.

Seems like this could be an integer overrun. Hint: sizeof(long) is 4 for 32 bit vs. 8 for 32 bit.
No time to further investigate this, though.

[ericonr]

I will try to check upstream.

[r-ricci]

The problem was fixed here.

[ericonr]

I think they are going to make a hot fix release, we can probably wait for that. It's good that their code caught alignment issues; on i686 it's indeed not an issue, but it could kill the process with SIGBUS on armv*

[ericonr]

I fixed the commit message before pushing, thanks!