Add support for static nix-tools #1998

Job	Run time
cabal	5m 26s
multi-target	5m 22s
nix-build	19m 46s
cabal-doExactConfig	5m 55s
runghc	5m 19s
tests-benchmarks	4m 36s
unit-tests	4m 18s
build-extra-hackages	1m 35s
docs	4m 18s
hix	3m 54s
hydra-ifdLevel-0-and-1	1m 13s
maintainer-scripts	53s
plan-extra-hackages	11s
shellFor-hoogle	1m 55s
shellFor-multiple-package	21s
shellFor-not-depends	34s
shellFor-single-package	7m 41s
check-materialization-concurrency	23s
check-path-support	7m 42s
closure-size	22s
haskell-nix-roots-do-not-require-IFDs	9s
hix-cabal	2m 30s
hydra-ifdLevel-2	16s
hydra-ifdLevel-3-and-ghc-8-10	43s
hydra-ifdLevel-3-and-ghc-9-2	10s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	11s
hydra-without-remote-builders	1m 26s
nix-tools	14s
update-docs	13s
	1h 27m 36s

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