Enable thread backend for all Alpaka builds #643
Merged
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Currently, the serial CPU backend is enabled in Alpaka only if you download Alpaka using FetchContent. When using a preinstalled version of Alpaka, the default backend is not correctly set. In this PR, I move the default backend configuration from a file which is only loaded for FetchContent usage to the main CMakeLists.txt file, allowing it to be used in all builds.