[Rpm-maint] [rpm-software-management/rpm] Check for overflow in computing region length (#1548)

[Demi Marie Obenour]

This uses the GCC builtin `__builtin_add_overflow`, so no casts or manual checks are needed.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1548

-- Commit Summary --

  * Add static assertions to RPM
  * Avoid overflow computing region offsets

-- File Changes --

    M lib/header.c (8)
    M system.h (10)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1548.patch
https://github.com/rpm-software-management/rpm/pull/1548.diff

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