Create empty dictionary file in native code.

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

...android/inputmethod/latin/ExpandableBinaryDictionary.java

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

...rsonalization/DecayingExpandableBinaryDictionaryBase.java

...rsonalization/PersonalizationDictionaryUpdateSession.java

.../personalization/PersonalizationPredictionDictionary.java

...atin/personalization/UserHistoryDictionaryBigramList.java

...atin/personalization/UserHistoryPredictionDictionary.java

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

...rc/suggest/policyimpl/dictionary/header/header_policy.cpp

.../policyimpl/dictionary/header/header_read_write_utils.cpp

.../com/android/inputmethod/latin/BinaryDictionaryTests.java