Removed even more warning that was found with -Wunused

- Removed test if HA_FT_WTYPE == HA_KEYTYPE_FLOAT as this never worked
  (HA_KEYTYPE_FLOAT is an enum)
- Define HA_FT_MAXLEN to 126 (was tested before but never defined)

client/mysql_upgrade.c

@@ -1144,7 +1144,7 @@ int main(int argc, char **argv)
   load_defaults_or_exit("my", load_default_groups, &argc, &argv);
   defaults_argv= argv; /* Must be freed by 'free_defaults' */
 
-#if __WIN__
+#if defined(__WIN__)
   if (GetModuleFileName(NULL, self_name, FN_REFLEN) == 0)
 #endif
   {