D26553: [colormanager] Fix build on older glib

[David Edmundson]

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REVISION SUMMARY
  Copies the approach we do for various GL calls not existing on the
  system headers.
  
  See D25962 <https://phabricator.kde.org/D25962>

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26553

AFFECTED FILES
  colorcorrection/clockskewnotifierengine_linux.cpp

To: davidedmundson, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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