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(ie. required) dependencies for Granatier and KGoldRunner, but only if
they are built (ie. if one passes -DBUILD_granatier=OFF and
-DBUILD_kgoldrunner=OFF), kdegames should build just fine without
libsndfile and OpenAL installed in the system.

In this case, wouldn't it be enough to call find_package(SndFile) and
find_package(OpenAL) and then add the respective macro_log_feature()
calls with the `REQUIRED' parameter set to TRUE instead of FALSE?

By putting these commands inside granatier/CMakeLists.txt and
kgoldrunner/CMakeLists.txt, you avoid calling them when granatier and
kgoldrunner are not build, while still failing to build when they are
not found.