perlDeps: Use lib.closePropagation

Apparentely, buildEnv in 20.03 no longer respects propagated-build-inputs.

Note that the use of a library function (closePropagation) seems fundamentally wrong to me - propagated-build-inputs should be used at runtime, not at evaluation time.

Created by  Eelco Dolstra  on March 31, 2020
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