Have dicttool use the native library to generate v4 dicts.

...m/android/inputmethod/latin/AbstractDictionaryWriter.java

java/src/com/android/inputmethod/latin/BinaryDictionary.java

.../inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java

...rc/com/android/inputmethod/latin/makedict/FormatSpec.java

...m/android/inputmethod/latin/makedict/Ver2DictDecoder.java

...m/android/inputmethod/latin/makedict/Ver2DictEncoder.java

...m/android/inputmethod/latin/makedict/Ver2DictUpdater.java

...m/android/inputmethod/latin/makedict/Ver4DictEncoder.java

native/jni/Android.mk

native/jni/CleanupNativeFileList.mk

native/jni/NativeFileList.mk

native/jni/jni_common.cpp

native/jni/src/defines.h

...olicyimpl/dictionary/structure/v4/ver4_dict_constants.cpp

...ni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp

.../jni/src/suggest/policyimpl/dictionary/utils/file_utils.h

...roid/inputmethod/latin/BinaryDictionaryDecayingTests.java

...id/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java

...m/android/inputmethod/latin/makedict/BinaryDictUtils.java

...roid/inputmethod/latin/makedict/Ver2DictDecoderTests.java