Please make the build reproducible.

[lamby]

Whilst working on the Reproducible Builds effort [0], we noticed
that wammu could not be built reproducibly as it iterates over
the filesystem in a non-deterministic order.

[0] https://reproducible-builds.org/

[codecov]

Codecov Report

Merging #49 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #49      +/-   ##
=========================================
+ Coverage    5.63%   5.64%   +0.01%     
=========================================
  Files          53      53              
  Lines        7755    7756       +1     
=========================================
+ Hits          437     438       +1     
  Misses       7318    7318

Impacted Files	Coverage Δ
setup.py	77.22% <100%> (+0.08%)	⬆️

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[nijel]

Merged, thanks for your contribution!