Bug#1076436: highway: Add autopkgtest.

[Nathan Teodosio]

Swapping the order of definition of the arrays as in this updated patch fixes
the stack smashing with the stack protector enabled — which is ideal so if you
still didn't upload the previous one, prefer this one —, maybe a bug in GCC[1].

Hopefully that will help aarch64 otherwise let's just try Clang.

Run in [2]. I'll run it against aarch64 too when Launchpad finally decides to
give it a builder.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115965
[2] https://autopkgtest.ubuntu.com/results/autopkgtest-oracular-nteodosio-rebuilds/oracular/amd64/h/highway/20240717_113010_6b611@/log.gz
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