[Merge] ~misterc/ubuntu-dev-tools:pbuilder-dist_more_archs into ubuntu-dev-tools:master

[Michael R. Crusoe]

This is a list of architectures it is likely that a user has setup for Ubuntu/Debian packaging.

I agree it would be nice to get this list from a library instead of maintaining it here.

I wasn't familiar with the `arch-test` tool, thanks for the tip. It tests which architectures are runnable on the current kernel (including the use of qemu-static-*, if binfmts are setup correctly). Running on my system, it seems to function correctly and comprehensively. 

So this list could be replaced with a call to `'arch-test', args[0]` if "arch-test" is added as a `Depends` or `Recommends` for the ubuntu-dev-tools binary package.
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https://code.launchpad.net/~misterc/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/379692
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