fa71d4062e5e52e33b2477d42b9fe92de9e1b357
before OPM/opm-simulators#1309 it was required, but this was not enforced by the build system because the SuiteSparse tests are run by the opm-core build system first and UMFpack is optional there. thanks to [at]akva2 and [at]blattms for the heads-up.
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