message: bazel: add note about binutils causing issues on os x
  We've seen multiple compilation issues by binutils being installed, so
  this adds a note to the README.
diff: @@ -68,6 +68,10 @@ for how to update or override dependencies.
  Alternatively, you can pass `--action_env` on the command line when running
  `bazel build`/`bazel test`.
  + Having the binutils keg installed in Brew is known to cause issues due to putting an incompatible
  + version of `ar` on the PATH, so if you run into issues building third party code like luajit
  + consider uninstalling binutils.
  +
  1. Install Golang on your machine. This is required as part of building [BoringSSL](https://boringssl.googlesource.com/boringssl/+/HEAD/BUILDING.md)
  and also for [Buildifer](https://github.com/bazelbuild/buildtools) which is used for formatting bazel BUILD files.
  1. `go get -u github.com/bazelbuild/buildtools/buildifier` to install buildifier. You may need to set `BUILDIFIER_BIN` to `$GOPATH/bin/buildifier`
  