Add the CROSSTOOL reference.
Add the CROSSTOOL reference.

RELNOTES: None.

SKIP_CI=Keeps throwing 502s for no reason.
PiperOrigin-RevId: 215424128

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