Fix support for pkgsStatic #3308

Job	Run time
nix-build	7m 32s
shellFor-not-depends	8m 6s
maintainer-scripts	11s
plan-extra-hackages	4m 34s
shellFor-hoogle	52s
unit-tests	27s
build-extra-hackages	24s
tests-benchmarks	5m 56s
cabal	19s
runghc	45s
multi-target	2m 28s
cabal-doExactConfig	6m 7s
shellFor-multiple-package	23s
check-nix-tools	3m 40s
shellFor-single-package	2m 37s
docs	13m 25s
check-path-support	2m 32s
update-docs	35s
hydra-ifdLevel-0-and-1	20m 17s
haskell-nix-roots-do-not-require-IFDs	1m 8s
closure-size	28s
hix-cabal	6m 48s
hydra-without-remote-builders-ghc9102	6m 19s
hydra-without-remote-builders-ghc967	20m 29s
hydra-ifdLevel-2	20m 18s
hix	6m 15s
hydra-ifdLevel-3	30m 18s
check-materialization-concurrency	24s
	2h 53m 37s

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