Port OnUpdateFontCacheSize.

diff --git a/php_imlib.c b/php_imlib.c
index e1a2828..d161bfa 100644
--- a/php_imlib.c
+++ b/php_imlib.c
@@ -207,7 +207,7 @@ zend_module_entry imlib_module_entry = {
 PHP_INI_MH(OnUpdateFontCacheSize)
 {
     int size;
-    if (sscanf(new_value,"%d",&size)==1)
+    if (sscanf(new_value->val,"%d",&size)==1)
     {
         imlib_set_font_cache_size(size);
         return SUCCESS;