D6992: Fix build on Linux without X11

[Bhushan Shah]

bshah added a comment.


  Also, you will need to make similar change on kinit.cpp in kinit.

REPOSITORY
  R285 KCrash

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

To: vkrause, #frameworks, bshah
Cc: bshah
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