Bazel: Add fixes for --incompatible_load_java_rules_from_bzl

Change-Id: Ibdc2fddf5418180cab05e43be3d9824b7dcc6318
diff --git a/BUILD b/BUILD
index 25ad207..6760a60 100644
--- a/BUILD
+++ b/BUILD
@@ -1,3 +1,4 @@
+load("@rules_java//java:defs.bzl", "java_binary", "java_library")
 load("@com_googlesource_gerrit_bazlets//tools/maven:package.bzl", "maven_package")
 load("//:prolog.bzl", "pl2j")