fix shared and tests prereqs #3902
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Closes #3899
Generally
make shareddid not work.In the past
make -j... libs netlib sharedworked probably by accident, my workinghypothesis is GNU make didn't parallelize over command line targets before v4.4.
In v4.4 it is consistently an error.
Maybe it's worth using GNU make 4.4 in CI with the
--shuffle=randomfeatureenabled, in case you want to catch make races in the future; it dumps the random
seed on build errors for reproducibility (although parallel builds make it not
entirely reproducible)