D9496: Fix greeter crashing with software rendering on wayland

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: Plasma, graesslin.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  kscreenlocker_greet crashes inside Mesa when running with llvmpipe or softpipe.
  This is because it creates file-backed buffers for DRI2 surfaces.
  So just allow creation of files for the affected targets.

TEST PLAN
  Ran a windowed kwin_wayland session and started kscreenlocker_greet with
  LIBGL_ALWAYS_SOFTWARE=1. Now it works.

REPOSITORY
  R133 KScreenLocker

BRANCH
  Plasma/5.11

REVISION DETAIL
  https://phabricator.kde.org/D9496

AFFECTED FILES
  greeter/autotests/CMakeLists.txt
  greeter/autotests/seccomp_test.cpp
  greeter/seccomp_filter.cpp

To: fvogt, #plasma, graesslin
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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