tests: stabilize `test-status-eacces.t` on Windows

As noted earlier, `chmod` doesn't complain in MSYS, but also doesn't alter the
file permissions such that they are unreadable.

I'm guessing the other lines of output in this area that are gated on `rhg` (or
not) will also need this, but I don't want to dig too deeply into something that
is apparently working well enough.

tests/test-status-eacces.t

@@ -28,13 +28,15 The proliferation of status implementati
   $ touch d1/y
   $ chmod -r d1
   $ hg status
-  d1: $EACCES$
+  d1: $EACCES$ (unix-permissions !)
   ! d1/x (rhg !)
   ! d1/x (no-rhg rust !)
+  ? d1/y (no-unix-permissions !)
   $ hg status
-  d1: $EACCES$
+  d1: $EACCES$ (unix-permissions !)
   ! d1/x (rust !)
   ! d1/x (no-rust rhg !)
+  ? d1/y (no-unix-permissions !)
   $ chmod +r d1
   $ hg status
   ? d1/y