Fix support for pkgsStatic #3310

Job	Run time
unit-tests	10s
runghc	1m 23s
nix-build	10m 41s
cabal-doExactConfig	27s
shellFor-multiple-package	49s
hix	55s
multi-target	11m 39s
hydra-ifdLevel-2	13m 37s
shellFor-single-package	39s
maintainer-scripts	11s
plan-extra-hackages	10s
shellFor-not-depends	2m 14s
shellFor-hoogle	17s
tests-benchmarks	16s
cabal	16s
docs	42s
hydra-ifdLevel-0-and-1	5m 37s
build-extra-hackages	42s
hydra-without-remote-builders-ghc9102	4m 18s
update-docs	9s
hix-cabal	13s
check-materialization-concurrency	35s
hydra-ifdLevel-3	30m 17s
check-nix-tools	1m 20s
closure-size	23s
haskell-nix-roots-do-not-require-IFDs	2m 0s
hydra-without-remote-builders-ghc967	11m 14s
check-path-support	10s
	1h 41m 24s

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