Make skylarkinterface visible

Keeping it in sync with /java/com/google/devtools/build/lib:syntax

PiperOrigin-RevId: 294953344
diff --git a/src/main/java/com/google/devtools/build/lib/skylarkinterface/BUILD b/src/main/java/com/google/devtools/build/lib/skylarkinterface/BUILD
index 4cf5392..91dfc46 100644
--- a/src/main/java/com/google/devtools/build/lib/skylarkinterface/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/skylarkinterface/BUILD
@@ -14,6 +14,7 @@
 java_library(
     name = "skylarkinterface",
     exported_plugins = ["//src/main/java/com/google/devtools/build/lib/skylarkinterface/processor:annotation_preprocessor"],
+    visibility = ["//visibility:public"],
     exports = [":annotations"],
 )