[perl #121732] fix t/op/filetest.t for windows

Tony: fix for minitest
(cherry picked from commit 683267f66c72ee510f225a18dc9cd0e4c1962532)
[perl #121733] fix t/op/stat.t 96 for windows

Tony: fixes for minitest
(cherry picked from commit 3442c4b3e005f425ea32c16225fbf4bd0cb1fb54)