D24805: Revert "CMakeLists.txt: use ccache if present"

[Kurt Hindenburg]

hindenburg accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R319 Konsole

BRANCH
  release/20.04

REVISION DETAIL
  https://phabricator.kde.org/D24805

To: asturmlechner, #konsole, hindenburg
Cc: kkharlamov, hindenburg, konsole-devel, hiangel, cent, EspadaV8, fbampaloukas, thsurrel, ngraham, maximilianocuria
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