Introduce the osx bazel crosstool template, with placeholder for cxx_builtin_include_directory.
Introduce the osx bazel crosstool template, with placeholder for cxx_builtin_include_directory.

RELNOTES: None.
PiperOrigin-RevId: 154094961

katre/bazel,bazelbuild/bazel,snnn/bazel,ulfjack/bazel,variac/bazel,ulfjack/bazel,bazelbuild/bazel,ulfjack/bazel,ButterflyNetwork/bazel,snnn/bazel,dslomov/bazel-windows,davidzchen/bazel,davidzchen/bazel,meteorcloudy/bazel,cushon/bazel,dslomov/bazel,davidzchen/bazel,spxtr/bazel,akira-baruah/bazel,meteorcloudy/bazel,variac/bazel,dslomov/bazel-windows,ulfjack/bazel,damienmg/bazel,juhalindfors/bazel-patches,bazelbuild/bazel,dslomov/bazel-windows,aehlig/bazel,bazelbuild/bazel,werkt/bazel,werkt/bazel,werkt/bazel,bazelbuild/bazel,damienmg/bazel,dslomov/bazel-windows,cushon/bazel,dropbox/bazel,davidzchen/bazel,safarmer/bazel,davidzchen/bazel,snnn/bazel,perezd/bazel,ulfjack/bazel,katre/bazel,damienmg/bazel,perezd/bazel,twitter-forks/bazel,dropbox/bazel,safarmer/bazel,twitter-forks/bazel,werkt/bazel,safarmer/bazel,cushon/bazel,damienmg/bazel,katre/bazel,variac/bazel,meteorcloudy/bazel,meteorcloudy/bazel,dropbox/bazel,katre/bazel,spxtr/bazel,ButterflyNetwork/bazel,katre/bazel,twitter-forks/bazel,snnn/bazel,akira-baruah/bazel,aehlig/bazel,akira-baruah/bazel,damienmg/bazel,perezd/bazel,snnn/bazel,meteorcloudy/bazel,bazelbuild/bazel,cushon/bazel,variac/bazel,akira-baruah/bazel,juhalindfors/bazel-patches,juhalindfors/bazel-patches,dropbox/bazel,aehlig/bazel,juhalindfors/bazel-patches,safarmer/bazel,perezd/bazel,twitter-forks/bazel,perezd/bazel,dslomov/bazel,davidzchen/bazel,spxtr/bazel,variac/bazel,damienmg/bazel,davidzchen/bazel,ButterflyNetwork/bazel,cushon/bazel,werkt/bazel,safarmer/bazel,twitter-forks/bazel,aehlig/bazel,snnn/bazel,variac/bazel,dslomov/bazel,katre/bazel,spxtr/bazel,perezd/bazel,aehlig/bazel,twitter-forks/bazel,meteorcloudy/bazel,cushon/bazel,dropbox/bazel,akira-baruah/bazel,dslomov/bazel,dslomov/bazel,ulfjack/bazel,variac/bazel,ButterflyNetwork/bazel,spxtr/bazel,dropbox/bazel,dslomov/bazel-windows,meteorcloudy/bazel,werkt/bazel,aehlig/bazel,snnn/bazel,ButterflyNetwork/bazel,aehlig/bazel,perezd/bazel,juhalindfors/bazel-patches,dslomov/bazel,spxtr/bazel,juhalindfors/bazel-patches,ButterflyNetwork/bazel,akira-baruah/bazel,dslomov/bazel-windows,safarmer/bazel,spxtr/bazel,juhalindfors/bazel-patches,dslomov/bazel,damienmg/bazel,twitter-forks/bazel,ulfjack/bazel