Set correct default icu data file for big endian

src/icu_util.h

Index: src/icu_util.h
diff --git a/src/icu_util.h b/src/icu_util.h
index c5ef862f515ebdfd3794d4674c4db5d4063c0431..af7f994231be1f6744029eb10e96e28394dfa77a 100644
--- a/src/icu_util.h
+++ b/src/icu_util.h
@@ -14,7 +14,7 @@ namespace internal {
 // function should be called before ICU is used.
 bool InitializeICU(const char* icu_data_file);
 
-// Like above, but using the default icudtl.dat location if icu_data_file is
+// Like above, but using the default icudt[lb].dat location if icu_data_file is
 // not specified.
 bool InitializeICUDefaultLocation(const char* exec_path,
                                   const char* icu_data_file);