[Bug 1709314] [NEW] Unbreak size and archive size generation of built RPMs on big-endian systems

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We use the rpm tools version 4.12.0.1 that come with Ubuntu Xenial to build packages.
However, that very version still has a bug:

https://github.com/rpm-software-
management/rpm/commit/104856ea17161eb3a508913c2b7ed701f2e4f6aa

On Big-Endian systems (and that's what we use), the Archive-Size field is handled wrongly.
 
 
---uname output---
Linux mclinx 4.4.0-83-generic #106-Ubuntu SMP Mon Jun 26 17:54:02 UTC 2017 s390x s390x s390x GNU/Linux
 
Machine Type = IBM zSeries 2964 (z13) 
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
 Build an RPM on a 64-bit Big-Endian system on Ubuntu-Xenial and check the Archive-Size field of the built RPM afterwards:

rpm -qp --xml example-1.3.0-1.s390x.rpm > example_1.3.0-1_rpm.xml

With the broken version you should find contents like these:

  <rpmTag name="Archivesize">
        <integer>0</integer>
  </rpmTag>

In case the Archive-Size is lower than 4GiB you'll always see a "0" as value here. The corrected rpmbuild command should post the correct archive size.
 
Userspace tool common name: rpmbuild 
 
The userspace tool has the following bit modes: 64-bit 

Userspace rpm: rpm

Userspace tool obtained from project website:  na

** Affects: ubuntu-z-systems
     Importance: Undecided
         Status: New

** Affects: rpm (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-157348 severity-medium targetmilestone-inin16043
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Unbreak size and archive size generation of built RPMs on big-endian systems
https://bugs.launchpad.net/bugs/1709314
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