XFAIL on WIN64 because of problem in libffi

(cherry picked from commit 6689bed)

Author: dstogov

ext/ffi/tests/bug80847.phpt

@@ -4,6 +4,7 @@ Bug #80847 (Nested structs)
 <?php
 if (!extension_loaded('ffi')) die('skip ffi extension not available');
 if (!extension_loaded('zend-test')) die('skip zend-test extension not available');
+if (PHP_OS_FAMILY == 'Windows' && ((1 << 31) > 0)) die('xfail libffi doesn\'t properly support passing big strctures by value on Windows/64');
 ?>
 --FILE--
 <?php