Move char_utils to the dictionary directory

Change-Id: Id397485407fe63600c9bb5c80d223042942b4d8a
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 34b3524..1b758c6 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -47,7 +47,6 @@
 
 LATIN_IME_CORE_SRC_FILES := \
     bigram_dictionary.cpp \
-    char_utils.cpp \
     correction.cpp \
     dic_traverse_wrapper.cpp \
     unigram_dictionary.cpp \
@@ -58,6 +57,7 @@
         dic_node_utils.cpp \
         dic_nodes_cache.cpp) \
     $(addprefix suggest/core/dictionary/, \
+        char_utils.cpp \
         dictionary.cpp \
         digraph_utils.cpp) \
     $(addprefix suggest/core/layout/, \