Issue with resolving symlinks (realpath, readlink, etc)

[João Eiras]

Hi.

Programs and functions that rely in realpath() are broken.

Example:
$ cd
$ ln -s /var symlink
$ cd symlink
$ readlink -m .
/var
$ mkdir subfolder
$ cd subfolder
$ readlink -m .
/home/user/symlink/subfolder
# should be /var/subfolder

This is the block I think is causing problems, as it breaks the loop
as soon as a real file is found, instead of iterating further upwards
resolving ancestors.
https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/path.cc#l994

There also a comment at line 736 that says:
"Scan path_copy from right to left looking either for a symlink or an
actual existing file. If an existing file is found, just return. If a
symlink is found, exit the for loop."

Thank you.

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