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ECMUninstallTarget: port generated code away from deprecated exec_program

Friedrich W. H. Kossebau requested to merge work/kossebau/portuninstallexecute into master

CMake since 3.28 warns by log noise about the use of exec_program which was deprecated for CMake 3.0, in favour of execute_process. So things got very spammy on a "make uninstall" (reminder, KDECMakeSettings pulls in ECMUninstallTarget).

See also https://cmake.org/cmake/help/latest/policy/CMP0153.html

Edit: also drop unused OUTPUT_VARIABLE arg while touching.

@krop

PS: Would also backport to KF5 once approved.

Edited by Friedrich W. H. Kossebau

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