message: bazel: change cfg of rule to exec
  The host environment isn't what you want when using remote execution
diff: @@ -82,12 +82,12 @@ proto_doc_aspect = aspect(
  "_protoc": attr.label(
  default = Label("@com_google_protobuf//:protoc"),
  executable = True,
  - cfg = "host",
  + cfg = "exec",
  ),
  "_protodoc": attr.label(
  default = Label("//tools/protodoc"),
  executable = True,
  - cfg = "host",
  + cfg = "exec",
  ),
  },
  implementation = _proto_doc_aspect_impl,
  