symlinks to unlinked but open files should work

[Helmut Karlowski]

Cygwin seems to look up a symlink wrong:

When the target-file is unlinked while it is used by a process the file  
still exists and the symlink should point to that file.

Test:

ln -s out1 lout1
exec >lout1
rm out1
[[ -w /dev/fd/1 ]] || echo /dev/fd/1 not writable 1>&2
rm lout1

Only on cygwin it prints the message.

-Helmut

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