D20343: fix handling of sub modules in git rely on ls-files --recurse-submodules, there since end of 2016

[Christoph Cullmann]

cullmann added a reviewer: loh.tar.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D20343

To: cullmann, dhaumann, #kate, loh.tar
Cc: kwrite-devel, gennad, domson, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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