[Rpm-maint] [rpm-software-management/rpm] Fix sigheader generation for big archives (#379)

[Michael Schroeder]

The old code just subtracted 8 bytes from the reserved space, but
that does not take tag alignment into account and led to the
signature header overwriting the package header.

We now use headerSizeof to calculate the real size difference.

Note that this only works reliable if the reserved space tag comes
last in the signature header!
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/379

-- Commit Summary --

  * Fix sigheader generation for big archives

-- File Changes --

    M lib/signature.c (43)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/379.patch
https://github.com/rpm-software-management/rpm/pull/379.diff

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