Set closefd=false for stdio file objects in VM init

- Prevent closing underlying fd when stdio wrappers are dropped
- Remove expectedFailure from test_fdopen in test_os.py

Author: youknowone

Lib/test/test_os.py

@@ -2350,7 +2350,6 @@ def check_bool(self, f, *args, **kwargs):
                 with self.assertRaises(RuntimeWarning):
                     f(fd, *args, **kwargs)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_fdopen(self):
         self.check(os.fdopen, encoding="utf-8")
         self.check_bool(os.fdopen, encoding="utf-8")

crates/vm/src/vm/mod.rs

@@ -328,6 +328,7 @@ impl VirtualMachine {
                         Some(if write { "wb" } else { "rb" }),
                         crate::stdlib::io::OpenArgs {
                             buffering: if unbuffered { 0 } else { -1 },
+                            closefd: false,
                             ..Default::default()
                         },
                         self,