Mark unused crosstool fields
Mark unused crosstool fields

RELNOTES: None.
PiperOrigin-RevId: 226302225

cushon/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,ulfjack/bazel,ulfjack/bazel,davidzchen/bazel,dslomov/bazel,bazelbuild/bazel,davidzchen/bazel,werkt/bazel,safarmer/bazel,cushon/bazel,dslomov/bazel,davidzchen/bazel,katre/bazel,akira-baruah/bazel,meteorcloudy/bazel,dslomov/bazel,safarmer/bazel,safarmer/bazel,aehlig/bazel,bazelbuild/bazel,meteorcloudy/bazel,katre/bazel,ulfjack/bazel,ulfjack/bazel,twitter-forks/bazel,cushon/bazel,perezd/bazel,ButterflyNetwork/bazel,davidzchen/bazel,meteorcloudy/bazel,aehlig/bazel,perezd/bazel,werkt/bazel,dslomov/bazel,dslomov/bazel-windows,bazelbuild/bazel,aehlig/bazel,safarmer/bazel,davidzchen/bazel,dslomov/bazel,dslomov/bazel-windows,perezd/bazel,ButterflyNetwork/bazel,ulfjack/bazel,werkt/bazel,meteorcloudy/bazel,bazelbuild/bazel,bazelbuild/bazel,twitter-forks/bazel,aehlig/bazel,aehlig/bazel,perezd/bazel,cushon/bazel,dslomov/bazel-windows,safarmer/bazel,meteorcloudy/bazel,bazelbuild/bazel,akira-baruah/bazel,cushon/bazel,dslomov/bazel,dslomov/bazel-windows,twitter-forks/bazel,perezd/bazel,dslomov/bazel-windows,twitter-forks/bazel,werkt/bazel,meteorcloudy/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,katre/bazel,twitter-forks/bazel,aehlig/bazel,ButterflyNetwork/bazel,cushon/bazel,aehlig/bazel,davidzchen/bazel,davidzchen/bazel,meteorcloudy/bazel,dslomov/bazel-windows,ulfjack/bazel,perezd/bazel,ulfjack/bazel,perezd/bazel,katre/bazel,akira-baruah/bazel,twitter-forks/bazel,werkt/bazel,dslomov/bazel,katre/bazel,twitter-forks/bazel,akira-baruah/bazel,safarmer/bazel,katre/bazel,werkt/bazel