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

Follow-up Comment #4, sr #110360 (project autoconf):

@Jannick
Thanks! I didn't want to pass a --host, because that would break
cross-platform compatibility. So I have put this into configure.ac

> 
> # override host_cpu in in special case (having dash)
> AS_IF([test "x$host_cpu" = 'armv7l'],[host_cpu=cortex-a53])
> AC_SUBST([host_cpu])
> 

That works without setting --host.
Not a perfect solution, but a suitable workaround.

I had tried something like that before, but had used BASH syntax, which hadn't
worked.

> @Zack:  Not sure if AC_CONONICAL_HOST and cousins should be prepared to be
able to digest also quadruplets config.sub might generate?

As I said, quadruples do produce an error

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