Added new Java Lite files to BUILD/pom.xml.

java/core/BUILD

diff --git a/java/core/BUILD b/java/core/BUILD
index 9308ba7..8ac355e 100644
--- a/java/core/BUILD
+++ b/java/core/BUILD
@@ -21,6 +21,8 @@
     "src/main/java/com/google/protobuf/ByteBufferWriter.java",
     "src/main/java/com/google/protobuf/ByteOutput.java",
     "src/main/java/com/google/protobuf/ByteString.java",
+    "src/main/java/com/google/protobuf/CanIgnoreReturnValue.java",
+    "src/main/java/com/google/protobuf/CheckReturnValue.java",
     "src/main/java/com/google/protobuf/CodedInputStream.java",
     "src/main/java/com/google/protobuf/CodedInputStreamReader.java",
     "src/main/java/com/google/protobuf/CodedOutputStream.java",