Fix build for pre-ECM CMake install.
The CI infrastructure started failing kdesrc-build after commit 864aa9d4, which I suspect is because the CI builds and installs kdesrc-build without setting up a KDE buildsystem (i.e. extra-cmake-modules). This is supported in kdesrc-build, but the commit that broke the build adds a reference a variable defined in ECM's KDEInstallDirs macro. Fixed by adding to the existing compat layer machinery in the existing CMakeLists.txt (at least, I hope!)
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