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.
Greg Ward, author of the original bfiles extension
Na'Tosha Bard of Unity Technologies
Fog Creek Software
Special thanks to the University of Toronto and the UCOSP program