bug#26022: 32-bit to 64-bit cross-builds

[Efraim Flashner]

Currently in build-aux/hydra we have i686->x86_64 cross-builds disabled,
but this is not the only one we should eliminate. Currently on
core-updates we have armhf->mips64el attempts and also armhf and i686->
aarch64 attemps, all of which fail as expected.

I propose we add two sub-lists of %supported-architectures, 32-bit and
64-bit; we can use them in package difinitions to eliminate 32-bit
architectures from building 64-bit only packages, and use them in
build-aux/hydra to prevent 32-bit -> 64-bit cross-builds.

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