Revert "CMakeLists.txt: use ccache if present"
Summary:
This was added for feature-parity with Meson-based projects; but an
individual package is the wrong place for that. To avoid the proliferation
of auto-detected ccache support in kde.org packages please submit such
a proposal to kde-frameworks-devel instead, where it could be added for
the benefit of all the projects using ECM. And more importantly, with a
standard switch to disable it for packaging environments
This reverts commit 007c2a08523887cf9c0445a288ad82994bd02a57.
Reviewers: Konsole, hindenburg
Reviewed By: Konsole, hindenburg
Subscribers: kkharlamov, hindenburg, konsole-devel, hiangel
Tags: Konsole
Differential Revision: https://phabricator.kde.org/D24805
(cherry picked from commit 3c171015c0d5b54c4fc3a77854fa359bef8e5ef6)