Add support for static nix-tools #1991

Job	Run time
cabal	9s
check-materialization-concurrency	20s
build-extra-hackages	5s
cabal-doExactConfig	9s
check-path-support	7s
closure-size	7s
docs	23s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	5m 0s
hix	27s
hydra-ifdLevel-0-and-1	13s
hydra-ifdLevel-2	8s
hydra-ifdLevel-3-and-ghc-8-10	9s
hydra-ifdLevel-3-and-ghc-9-2	11s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	7s
hydra-without-remote-builders	16s
maintainer-scripts	17s
multi-target	16s
nix-build	24s
nix-tools	11s
plan-extra-hackages	5s
runghc	9s
shellFor-hoogle	8s
shellFor-multiple-package	14s
shellFor-not-depends	11s
shellFor-single-package	15s
tests-benchmarks	12s
unit-tests	11s
update-docs	4s
	10m 36s

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