bug#8035: Processing of .. in a file path after going thru symlink

[spucci <slpnabble@blackberry-hill.com>]

The behavior is general, but it's a particular problem with next-error: 

When emacs attempts to find a file with "../" as a path component, it
appears to be "smart" about it and simply remove the previous directory path
(e.g., "foo/bar/../x" gets converted to "foo/x").  But if bar is a symlink,
then it doesn't properly find the file.  So in compiler output, which
references such files, the next-error function fails to find the file with
the given name. 

mkdir dest 
mkdir dest/subdir 
mkdir src 
ln -s ../dest/subdir src/subdir 
echo "#error This is an error" > dest/foo.c 

Now M-x compile, and give it cc -c src/subdir/../foo.c 

*compilation* buffer has: 
cc -c src/subdir/../foo.c 
src/subdir/../foo.c:1:2: error: #error This is an error 

and do a next-error: Emacs complains it can't find the file.  And if you try
to find-file that file path (src/subdir/../foo.c) it doesn't work either. 
Nor does "emacsclient src/subdir/../foo.c.  I couldn't find an option to
disable this behavior; it seems like there should be one even if the default
continues to be as it is today.

This is Gnu Emacs 23.2.1 I built myself on MacOS X 10.6.6. 

Thanks, 
  Steve 

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