Add Bazel file for the ECJ 4.6.1 prebuilt

Change-Id: I74ba5b261be91594157827adacec3caad82c2bce
diff --git a/common/m2/repository/org/eclipse/jdt/core/compiler/ecj/4.6.1/BUILD b/common/m2/repository/org/eclipse/jdt/core/compiler/ecj/4.6.1/BUILD
new file mode 100644
index 0000000..d52509b
--- /dev/null
+++ b/common/m2/repository/org/eclipse/jdt/core/compiler/ecj/4.6.1/BUILD
@@ -0,0 +1,7 @@
+# This BUILD file was generated by //tools/base/bazel:java_import_generator, please do not edit.
+
+java_import(
+    name = "jar",
+    jars = ["ecj-4.6.1.jar"],
+    visibility = ["//visibility:public"],
+)