This function tests if $PWD is the same as getcwd() using st_dev and
st_ino. But on Windows these fields are always zero
(mingw.c:do_lstat). If cwd is moved away, I think falling back to $PWD
is wrong. I don't understand the use of $PWD in the first place.
1b9a946 (Use nonrelative paths instead of absolute paths for cloned
repositories - 2008-06-05) does not explain much.
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