Remove unused function.

diff --git a/php_imlib.c b/php_imlib.c
index 7adbd8f..478d649 100644
--- a/php_imlib.c
+++ b/php_imlib.c
@@ -820,20 +820,6 @@ PHP_MINFO_FUNCTION(imlib)
 	}
 }

-static void _php_convert_four_longs(zval **zone, zval **ztwo, zval **zthree,
-                                    zval **zfour, int *one, int *two,
-                                    int *three, int *four)
-{
-   convert_to_long_ex(zone);
-   convert_to_long_ex(ztwo);
-   convert_to_long_ex(zthree);
-   convert_to_long_ex(zfour);
-   *one = Z_LVAL_PP(zone);
-   *two = Z_LVAL_PP(ztwo);
-   *three = Z_LVAL_PP(zthree);
-   *four = Z_LVAL_PP(zfour);
-}
-
 static int _php_handle_cliprect_array(zval **dbox, char *func_name,
                                       int *x, int *y, int *w, int *h TSRMLS_DC)
 {