D8872: Use software backend for welcome page

[Sven Brauch]

brauch created this revision.
brauch added reviewers: apol, mwolff, kfunk.
Restricted Application added a subscriber: kdevelop-devel.

REVISION SUMMARY
  We really don't need to use OpenGL for drawing 3 buttons and a grey background. Using the software renderer should
  
  - fix bugs like https://bugs.kde.org/show_bug.cgi?id=386527
  - make it easily possible to ship the welcome page enabled in the AppImage
  - make it easier to use KDevelop in VMs

TEST PLAN
  Seems to work fine and doesn't feel slow or anything.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D8872

AFFECTED FILES
  plugins/welcomepage/welcomepageplugin.cpp

To: brauch, apol, mwolff, kfunk
Cc: kdevelop-devel
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