Add support for static nix-tools #1740

Job	Run time
build-extra-hackages	11s
cabal	15s
cabal-doExactConfig	16s
check-materialization-concurrency	22s
check-path-support	11s
closure-size	9s
docs	30s
haskell-nix-roots-do-not-require-IFDs	10s
hix	39s
hix-cabal	1m 37s
hydra-ifdLevel-0-and-1	18s
hydra-ifdLevel-2	11s
hydra-ifdLevel-3-and-ghc-8-10	12s
hydra-ifdLevel-3-and-ghc-9-2	12s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	11s
hydra-without-remote-builders	1m 24s
maintainer-scripts	9s
multi-target	22s
nix-build	1m 2s
nix-tools	10s
plan-extra-hackages	9s
runghc	9s
shellFor-hoogle	13s
shellFor-multiple-package	20s
shellFor-not-depends	19s
shellFor-single-package	16s
tests-benchmarks	12s
unit-tests	11s
update-docs	9s
	10m 29s

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