[Reproducible-builds] Bug#801523: perl: make PPPort.so not vary with file system ordering

[Niko Tyni]

Package: perl
Version: 5.22.0-4
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: fileordering
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

As seen at
 https://reproducible.debian.net/rb-pkg/experimental/amd64/perl.html
 https://reproducible.debian.net/dbd/experimental/amd64/perl_5.22.0-4.debbindiff.html

the compiled file 
 usr/lib/x86_64-linux-gnu/perl/5.22.0/auto/Devel/PPPort/PPPort.so

varies with file system ordering, because PPPort_xs.PL uses readdir()
to generate the list of files to process.

This breaks build reproducibility, as readdir() ordering can vary
between file systems. It's easy to test with the disorderfs package,
recently added to the reproducible.debian.net setup.

The attached patch fixes the issue. The reproducible.debian.net logs
have a size cutoff so we can't know if this was the only issue of its
kind. I was expecting more of them, but my test didn't turn up any.
-- 
Niko Tyni   ntyni at debian.org
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