Merge branch 'stable-2.14' into stable-2.15

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

Change-Id: Iee5b3c74383740d689f36e2562a2d5af5fa37b4f
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