CMake: Decouple ELPA dependency from LCAO #639

Job	Run time
Build without LCAO	5m 9s
Build with CUDA support	14m 3s
Build without ELPA	8m 16s
Build with Intel toolchain	8m 39s
Build without LCAO and MPI	4m 13s
Build extra components with Intel toolchain	19m 5s
Build with GNU toolchain	8m 15s
Build extra components with GNU toolchain	15m 32s
Build without MPI	6m 24s
	1h 29m 36s

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