[aarch64] sbcl build failure

[Vincent Legoll]

Hello,

I'm looking at the following cl-zstd build failure:
https://ci.guix.gnu.org/build/133326/details
which is caused by sbcl build failure that I
reproduced locally.

I diffed the CI build log output with my local
attempt and got the same thing modulo timings
[1] and other harmless stuff.

[1] the Odroid N2 looks roughly 3x faster than the CI
on this specific build / test (total 30 mins vs 90).

-- 
Vincent Legoll