D21141: Port ExternalPartStorage::self to C++11 singleton syntax.

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

BRANCH
  itemretriever (branched from Applications/19.04)

REVISION DETAIL
  https://phabricator.kde.org/D21141

To: dfaure, dvratil, vkrause
Cc: kde-pim
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