Add support for static nix-tools #1743

Job	Run time
cabal-doExactConfig	12s
cabal	12s
check-materialization-concurrency	22s
build-extra-hackages	10s
check-path-support	7s
docs	41s
closure-size	8s
haskell-nix-roots-do-not-require-IFDs	10s
hix	30s
hix-cabal	15s
hydra-ifdLevel-0-and-1	18s
hydra-ifdLevel-2	12s
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	34s
maintainer-scripts	10s
multi-target	13s
nix-build	29s
nix-tools	10s
plan-extra-hackages	9s
runghc	10s
shellFor-hoogle	12s
shellFor-multiple-package	13s
shellFor-not-depends	14s
shellFor-single-package	17s
tests-benchmarks	10s
unit-tests	12s
update-docs	7s
	7m 12s

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