Fix support for pkgsStatic #3304

Job	Run time
nix-build	13m 17s
cabal-doExactConfig	13m 8s
shellFor-multiple-package	14m 47s
shellFor-not-depends	1m 52s
shellFor-hoogle	2m 16s
unit-tests	1m 14s
maintainer-scripts	14s
tests-benchmarks	14m 11s
cabal	13m 9s
multi-target	4m 13s
runghc	24s
shellFor-single-package	40s
plan-extra-hackages	18s
hydra-without-remote-builders-ghc967	11m 31s
build-extra-hackages	17s
hix	1m 53s
hydra-ifdLevel-0-and-1	8m 16s
hix-cabal	12m 54s
hydra-ifdLevel-2	20m 19s
docs	22m 26s
closure-size	9s
hydra-ifdLevel-3	30m 18s
check-path-support	1m 21s
update-docs	43s
haskell-nix-roots-do-not-require-IFDs	4m 32s
check-materialization-concurrency	54s
hydra-without-remote-builders-ghc9102	25m 26s
check-nix-tools	5m 38s
	3h 46m 20s

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