D12987: Fix creating temporary directory for R backend

[Alexander Semke]

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

REPOSITORY
  R55 Cantor

BRANCH
  fix-R-backend-tmpdir-error

REVISION DETAIL
  https://phabricator.kde.org/D12987

To: sirgienko, asemke
Cc: kde-edu, asemke, narvaez, apol
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