Fix bug #73331 - do not try to serialize/unserialize objects wddx can not handle

Proper soltion would be to call serialize/unserialize and deal with the result,
but this requires more work that should be done by wddx maintainer (not me).
static int row_compare(zval *object1, zval *object2 TSRMLS_DC)
{
	return -1;
}

static int row_compare(zval *object1, zval *object2 TSRMLS_DC)
{
	return -1;
}
