[Rpm-maint] [rpm-software-management/rpm] Rust bindings for rpmlib (#429)

[Jeff Johnson]

Re: ref counting.

Yes, an increment is exactly a *Link() call, and a decrement (and possible delayed/lazy de-allocation) is a * Free() call.

There is also a *Unlink() method that is strictly a decrement w/o a deallocation, but that is really only useful when debugging, or when some snarly ref counting bug necessitates a Big Hammer Hack: all usual cases should use *Free() instead.

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