Merge branch 'stable-2.14' into stable-2.15

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

Change-Id: Idfa7e230a4a9f5a1bff8e773ab6bc4ec54206dcc

tools/bzl/BUILD

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