[Rpm-maint] [rpm-software-management/rpm] Avoid `n * m` memory allocation in base2bin() (Issue #1984)

[Demi Marie Obenour]

The problem is that `base2bin()` uses `n * m` memory, where `n` is the number of entries and `m` is the length of the *largest* entry.  `hex2bin()` used to have a similar problem, but it was fixed in #1914.  `base2bin` can use the same data structure, though care needs to be taken as base64 decoding is more complex than hex decoding.

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