Make proto_support bzl_library visible

PiperOrigin-RevId: 684767814
Change-Id: I37ff05039ad64ac7ee20c88910e4832c3090404c

java/private/BUILD

diff --git a/java/private/BUILD b/java/private/BUILD
index 75e6e18..5afe66c 100644
--- a/java/private/BUILD
+++ b/java/private/BUILD
@@ -8,9 +8,11 @@
     visibility = ["//java:__subpackages__"],
 )
 
+# Exposed for use by the protobuf.
 bzl_library(
     name = "proto_support",
     srcs = ["proto_support.bzl"],
+    visibility = ["//visibility:public"],
     deps = [":private"],
 )