D7732: Force KAuth helpers to have UTF-8 support

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  Our helper runs as root and doesn't have the user's environment
  (including $LANG). This defaults to one without UTF-8.
  
  Without a locale with UTF-8
  QFileInfo::exists("/backgrounds/crepé.png") returns false.
  
  This causes problems in the SDDM KCM's code to set a wallpaper. (and
  probably elsewhere)
  
  By forcing the locale we fix that. It doesn't matter that we're using C,
  as we don't have any UI related code in the helpers.
  
  BUG: 384294

TEST PLAN
  Tested case in bug report setting a wallpaper from the SDDM KCM

REPOSITORY
  R283 KAuth

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7732

AFFECTED FILES
  src/kauthhelpersupport.cpp

To: davidedmundson
Cc: #frameworks
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