builder: Add a set_rdev() convenience #377
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Commonly one may be building tar archives from the filesystem in a custom way, or operating on a translation of a non-tar format which uses rdev, not split major/minor.
Today one needs to replicate the nontrivial bit manipulations to split the device; but since we have that code anyways in our own "build from filesystem" code, let's just add it as a public API.