Fix support for pkgsStatic #3305

Job	Run time
runghc	1m 34s
tests-benchmarks	22m 21s
unit-tests	7m 16s
nix-build	2m 32s
cabal	1m 29s
hix	21m 51s
maintainer-scripts	1m 25s
shellFor-hoogle	17s
multi-target	17s
shellFor-single-package	16s
shellFor-multiple-package	17s
cabal-doExactConfig	17s
shellFor-not-depends	16s
docs	26m 8s
build-extra-hackages	1m 1s
plan-extra-hackages	14s
closure-size	9s
check-path-support	1m 52s
check-materialization-concurrency	25s
haskell-nix-roots-do-not-require-IFDs	18m 29s
hix-cabal	6m 33s
hydra-ifdLevel-2	20m 18s
hydra-without-remote-builders-ghc967	39m 44s
hydra-without-remote-builders-ghc9102	35m 15s
check-nix-tools	4m 17s
hydra-ifdLevel-0-and-1	14m 29s
update-docs	11s
hydra-ifdLevel-3	30m 17s
	4h 19m 30s

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