[Rpm-maint] [rpm-software-management/rpm] Please support smaller build-ids (#950)

[Frank Ch. Eigler]

To complete my partial distro-wide buildid analysis, for fedora30 x86-64
(from its first branch last summer till the present) all built packages add up to apprx. 780 GB of build artifacts.  Based on an extrapolation from a single-day 'compose' set of one version of each package, this maps to *very roughly* 600 million distinct buildids over the course of a distro for that arch, and it still has another eight months of lifespan left.

Looking at the birthday-attack probability table, the probability of collisions at that kind of scale (10**9) with a 64-bit hash is already on the several-percent level.

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