make librechroot target arch agnostic

in the light of my attempts to create a riscv64 parabola port, I would
like to see the following changes made to librechroot.

The patch removes the hard-coded arm cross arch checks in favour of a
more general approach, that works for more architectures. As a side
effect, this now also would behave correctly when creating x86 chroots
on arm, although why anyone would choose to do this is beyond me.

Reviewed-By: Luke Shumaker <lukeshu@parabola.nu>
[LS: Added quotes]

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