[Bug build/31883] ISA level support configure check relies on bashism

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31883

--- Comment #1 from Sam James <sam at gentoo dot org> ---
I would just fix it but I'm not really sure what we want to do here.

We can pass it into expr (although expr kind of sucks) or do (( ... )) but then
we have to remove the var= prefix before and inject it again after, and then
maybe at that point someone has a better idea for doing the check to begin
with. Dunno?

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