Unbreak busted linking. #1617

Job	Run time
build-extra-hackages	25s
cabal	37s
cabal-doExactConfig	40s
check-materialization-concurrency	20s
closure-size	8s
docs	57s
haskell-nix-roots-do-not-require-IFDs	8s
check-path-support	29s
hix	1m 17s
hix-cabal	17s
hydra-ifdLevel-0-and-1	19s
hydra-ifdLevel-2	15s
hydra-ifdLevel-3-and-ghc-8-10	13s
hydra-ifdLevel-3-and-ghc-9-2	11s
hydra-without-remote-builders	2m 43s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	14s
maintainer-scripts	10s
multi-target	22s
nix-build	1m 57s
plan-extra-hackages	10s
nix-tools	10s
runghc	10s
shellFor-multiple-package	13s
shellFor-not-depends	22s
shellFor-hoogle	13s
shellFor-single-package	20s
tests-benchmarks	8s
update-docs	4s
unit-tests	11s
	13m 43s

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