D6992: Fix build on Linux without X11

Thu Dec 21 12:57:45 UTC 2017

dfaure added a comment.

  so this is going to call getenv("") ? Or is this code path never called?

REPOSITORY
  R285 KCrash

REVISION DETAIL
  https://phabricator.kde.org/D6992

To: vkrause, #frameworks, bshah, graesslin
Cc: dfaure, graesslin, bshah
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