[Rpm-maint] [rpm-software-management/rpm] add support for %{shrink:} (#296)

[Panu Matilainen]

Merged manually (commit 9a9eefc40e56821a2bc12de78114c623a7d5a461 and 7fe183d66008c379bcdeb8fd82a8585924347b92), I added back the mention it's ported from rpm5.

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