Fix support for pkgsStatic #3306

Job	Run time
nix-build	42m 46s
runghc	15m 54s
cabal	1m 5s
unit-tests	31s
shellFor-not-depends	1m 3s
hydra-ifdLevel-2	10m 23s
hix	3m 26s
hydra-ifdLevel-3	30m 20s
check-materialization-concurrency	39s
maintainer-scripts	10s
check-path-support	16s
tests-benchmarks	28s
multi-target	3m 39s
closure-size	9s
shellFor-single-package	2m 2s
update-docs	10s
build-extra-hackages	16s
shellFor-multiple-package	1m 7s
cabal-doExactConfig	17s
shellFor-hoogle	24s
plan-extra-hackages	14s
docs	11m 59s
hydra-ifdLevel-0-and-1	4m 44s
hydra-without-remote-builders-ghc9102	7m 13s
haskell-nix-roots-do-not-require-IFDs	8m 35s
check-nix-tools	2m 16s
hix-cabal	5m 59s
hydra-without-remote-builders-ghc967	5m 39s
	2h 41m 44s

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