[sr #110360] AC_CANONICAL_HOST sets wrong $host_cpu on Raspberry Pi 3

Follow-up Comment #7, sr #110360 (project autoconf):

It works on both models with

host_cpu=$(LANG=en_US lscpu | grep 'Model name' | cut -d: -f2 | tr '[:upper:]'
'[:lower:]')

I'm thinking about how you would cross-compile to Raspberry... you'd have to
set a --host, but couldn't set that to cortex-aXX. The CPU names never contain
underscores, do they? So you could specify --host=cortex_a53-os-abi or return
cortex_a53-os-abi from config.guess and sed s/_/-/g that somewhere in
AC_CANONICAL_HOST...

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