Bug fix and enchantment in cygpath.cc

[Ilya]

This patch is against cygpath.cc 1.42.
In 1.43 addressed bug was already fixed, but I believe my fix is a bit 
better.

Current fix just returns filename, in case filename is for a nonexistent 
file.  I think that internal short to long file name conversion routine 
could be used in this case, because it deals ok with nonexistent files.
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