Make the cc wkt proto target public.
diff --git a/BUILD b/BUILD
index f374e8a..7c09605 100644
--- a/BUILD
+++ b/BUILD
@@ -157,6 +157,7 @@
     internal_bootstrap_hack = 1,
     protoc = ":protoc",
     default_runtime = ":protobuf",
+    visibility = ["//visibility:public"],
 )
 
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