CMake: Rewrite FindMKL.cmake #16407

Job	Run time
Build with Intel toolchain	7m 31s
Build extra components with Intel toolchain	13m 40s
Build without ELPA	7m 5s
Build without LCAO	5m 21s
Build without MPI	6m 5s
Build with GNU toolchain	7m 53s
Build with CUDA support	12m 22s
Build extra components with GNU toolchain	17m 12s
Build without LCAO and MPI	3m 27s
	1h 20m 36s

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