Demontrate that http_archive can pick up a missing build file
Demontrate that http_archive can pick up a missing build file

The http_archive command from @bazel_tools can add a BUILD file to an
external repository. Add a test ensuring that changes to that file, in
particular the addition of a previously missing file, are tracked
properly.

Provides a workaround for #3637.

Change-Id: Ibd6a3336834686a13eaa1f9ce7d4c6223410b222
PiperOrigin-RevId: 182221653

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