CMake

ksparse recovery sketch (ba dum tss) #1119

Job	Run time
full-build (ubuntu-latest, "-DL0_SAMPLING")	22s
full-build (ubuntu-latest, "-DNO_EAGER_DSU")	19s
full-build (ubuntu-latest, "")	22s
full-build (ubuntu-20.04, "-DL0_SAMPLING")	36s
full-build (ubuntu-20.04, "-DNO_EAGER_DSU")	36s
full-build (ubuntu-20.04, "")	35s
	2m 50s

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