[Rpm-maint] [rpm-software-management/rpm] Improve hardlink handling in the disk space calculation (#394)

[Michael Schroeder]

Before this commit, rpm simply did not take hardlinks into account when calculating disk space requirements. This made it fail spectaculary for packages that contain a high number of hardlinks, like glibc-locale.
    
We now "bind" the file size to the last hardlink member. This is still not 100% correct as the last file may not get installed in some cases or only the last file may be replaced. But it is still much better than what rpm did before.

You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/394

-- Commit Summary --

  * Fix inode handling for zero-sized files
  * Improve hardlink handling in the disk space calculation

-- File Changes --

    M lib/rpmfiles.h (2)
    M lib/transaction.c (32)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/394.patch
https://github.com/rpm-software-management/rpm/pull/394.diff

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