D12476: kcm_opengl: Fix retrieval of DRI information

[Lindsay Roberts]

roberts created this revision.
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REVISION SUMMARY
  Currently DRI information retrieval is attempted via /proc/dri, which
  was removed from the linux kernel in v3.12 (2013). This information
  includes the kernel driver in use as well as card identification sourced
  from pci.ids database.
  
  This adds support for retrieving this information in the same vein via
  /dev and /sys for modern kernels.

TEST PLAN
  kcmshell5 opengl should correctly display kernel driver.

REPOSITORY
  R102 KInfoCenter

BRANCH
  kcm_opengl_fix_dri_info

REVISION DETAIL
  https://phabricator.kde.org/D12476

AFFECTED FILES
  Modules/opengl/opengl.cpp

To: roberts, #plasma
Cc: plasma-devel, #plasma, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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