Bazel: Fix another usage of tools in action inputs

See I744ae1b28 for why this is necessary. One of the usages was missed
and hence it's corrected with this change.

Tested via running
$ bazel build //...
before (-> build error) and after (-> build success) this change.

Change-Id: I8df26f7b03ea6d261e543883a840a4dbb74dc0c0
(cherry picked from commit 287e860b82)

tools/bzl/asciidoc.bzl

@@ -115,8 +115,9 @@ def _asciidoc_impl(ctx):
     ]
     args.extend(_generate_asciidoc_args(ctx))
     ctx.actions.run(
-        inputs = ctx.files.srcs + [ctx.executable._exe, ctx.file.version],
+        inputs = ctx.files.srcs + [ctx.file.version],
         outputs = ctx.outputs.outs,
+        tools = [ctx.executable._exe],
         executable = ctx.executable._exe,
         arguments = args,
         progress_message = "Rendering asciidoctor files for %s" % ctx.label.name,