[Rpm-maint] [rpm-software-management/rpm] Add rreallocn() to librpmio public API (PR #1915)

[Demi Marie Obenour]

> Based on @DemiMarie 's patch in #1900 but base around realloc() as that's the more flexible call that we'd need anyhow. Add xmallocn() as a shorthand macro instead.

That’s very much fine.  There is a caveat with `realloc(x, 0)` (it frees `x` in some implementations, including glibc) but that is not an issue because you explicitly check for both overflow and for the case where either argument to the multiplication is 0.

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