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

[Jeff Johnson]

There are 3-4 levels of memory usage with header tag data using MINMEM:

1) the rpmtd container with malloc/free, non-refcounted
2) (string arrays only) the array of pointers to strings, free'd on release
3) the data, protected by the header ref count
4) (if used) string pools to memoize/uniqify tag data

Simplest approach is not to use data outside of the narrow access window: always copy.

Not using MINMEM is another approach.

(aside)
Disclaimer: I've only a little bit of experience with rpmtd memory usage, none with string pools. I chose a different/simpler approach ("Always malloc tag data") to solve identical issues as MINMEM and rpmtd solve in RPM4.

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