Sort input file list

[bmwiedemann]

so that nut builds in a reproducible way
in spite of indeterministic filesystem readdir order
and http://bugs.python.org/issue30461

See https://reproducible-builds.org/ for why this is good.

[bmwiedemann]

Can I do something to help get this merged?

[jimklimov]

Poke more? :)
Looks good to me, though I think the sorting here would be based on LANG or LC_ALL active during a build (not sure if that impacts the ASCII filenames anyhow).

[bmwiedemann]

I think that is more a concern for the standalone sort(1) program and less so for the builtin perl/python sort functions.

https://stackoverflow.com/questions/8776807/is-pythons-sort-function-the-same-as-linuxs-sort-with-lc-all-c seems to suggest that it is not using locales by default.

[jimklimov]

@clepple : was there a particular reason you self-assigned this PR and it got on hold over time, e.g. do you have something in mind to experiment with / make sure of? Or can it indeed be merged?

[aquette]

LGTM
as for Charles' self assignment, I probably asked him to take over...

[aquette]

@bmwiedemann thanks for your contribution