/bin/pwd, cygpath -wa fail under native symlink

[Ernie Rael <err at raelity dot com>]

(CYGWIN_NT-6.1 spirit 3.1.1(0.340/5/3) 2019-12-18 09:28 x86_64 Cygwin, win7)

The windows root is C:, cygwin root is on F:.
A native symlink under C: that points into F: gets
an incorrect result from cygpath -wa.

Notice that when the current directory is the target of the symlink
then the result is ok. But any deeper in the tree fails. To summarize:

    @ /a/src/jvi-dev/jvi
$ cygpath -wa .
C:\f\src\jvi-dev\jvi <<<<<<< correct
    @ /a/src/jvi-dev/jvi/src
$ cygpath -wa .
C:\a\src\jvi-dev\jvi\src <<<<<<< fail

=== more detail ===

    @ /a/src/jvi-dev
$ ls -l jvi
lrwxrwxrwx 1 erra None 18 Dec 23 15:16 jvi -> /f/src/jvi-dev/jvi

    @ /a/src/jvi-dev
$ junction jvi

Junction v1.06 - Windows junction creator and reparse point viewer
Copyright (C) 2000-2010 Mark Russinovich
Sysinternals - www.sysinternals.com

C:\a\src\jvi-dev\jvi: SYMBOLIC LINK
   Print Name     : C:\f\src\jvi-dev\jvi
   Substitute Name: \??\C:\f\src\jvi-dev\jvi

    @ /a/src/jvi-dev
$ cygpath -wa jvi
C:\a\src\jvi-dev\jvi

    @ /a/src/jvi-dev
$ cd jvi

    @ /a/src/jvi-dev/jvi
$ cygpath -wa .
C:\f\src\jvi-dev\jvi <<<<<<< correct

    @ /a/src/jvi-dev/jvi
$ cd src

    @ /a/src/jvi-dev/jvi/src
$ cygpath -wa .
C:\a\src\jvi-dev\jvi\src <<<<<<< fail

=== some possibly relevent stuff from the mount table

$ mount
F:/cygwin64 on / type ntfs (binary,auto)
C:/f on /f type ntfs (binary,user)
F:/c on /c type ntfs (binary,user)
F: on /cygdrive/f type ntfs (binary,posix=0,user,noumount,auto)


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