Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Add explanatory comment to empty BUILD file(s)

Change-Id: I3297359014625cbe898c1e3840dbf3db5bf62e9d
diff --git a/tools/BUILD b/tools/BUILD
index e69de29..c5ed0b7 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -0,0 +1 @@
+# Empty file required by Bazel
diff --git a/tools/bzl/BUILD b/tools/bzl/BUILD
index e69de29..c5ed0b7 100644
--- a/tools/bzl/BUILD
+++ b/tools/bzl/BUILD
@@ -0,0 +1 @@
+# Empty file required by Bazel