Add support for static nix-tools #1778

Job	Run time
build-extra-hackages	23s
cabal-doExactConfig	51s
check-materialization-concurrency	25s
cabal	51s
check-path-support	32s
closure-size	24s
docs	1m 3s
hix	51s
hix-cabal	19s
hydra-ifdLevel-0-and-1	32s
haskell-nix-roots-do-not-require-IFDs	18s
hydra-ifdLevel-2	25s
hydra-ifdLevel-3-and-ghc-8-10	23s
hydra-ifdLevel-3-and-ghc-9-2	23s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	11s
hydra-without-remote-builders	1m 6s
maintainer-scripts	11s
multi-target	16s
nix-build	49s
nix-tools	10s
runghc	10s
shellFor-hoogle	11s
plan-extra-hackages	8s
shellFor-multiple-package	13s
shellFor-not-depends	15s
shellFor-single-package	28s
tests-benchmarks	9s
unit-tests	11s
update-docs	6s
	12m 14s

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