[Rpm-maint] [rpm-software-management/rpm] Use unsigned integers everywhere in header code (Issue #2385)

[Panu Matilainen]

First round of this work happened way back in 2008 for rpm 4.6.0, addressing the public API facing stuff mostly. The more recent header/package overhaul in 2018 consolidated much of the remaining mess, but what remains to be done is fixing the mishmash of integer types used in the internals.

All numeric data in headers (except for one) is unsigned, and so should be the types. This will also improve security as there are fewer things to get wrong wrt range checking, overflow/wraparound behavior is sane etc.

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