(str_choose_str_functions): small fix.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

lib/strutil/strutil.c

@@ -338,7 +338,7 @@ str_test_encoding_class (const char *encoding, const char **table)
 }
 
 static void
-str_choose_str_functions ()
+str_choose_str_functions (void)
 {
     if (str_test_encoding_class (codeset, str_utf8_encodings))
     {