Add FindKML.cmake and resolve FFTW3 issue (#7576) #680

Job	Run time
Build extra components with Intel toolchain	13m 36s
Build with GNU toolchain	7m 26s
Build without MPI	6m 3s
Build with Intel toolchain	7m 48s
Build with CUDA support	12m 38s
Build without LCAO	5m 3s
Build extra components with GNU toolchain	16m 28s
Build without LCAO and MPI	4m 12s
Build without ELPA	7m 36s
	1h 20m 50s

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