canonicalize_file_name should support win32 shortcuts

[Sam Steingold]

it appears that neither canonicalize nor canonicalize-lgpl support win32
shortcuts (either used directly or as used by cygwin).
it would be nice if they did - then we would be able to use
canonicalize-lgpl in clisp.

now clisp uses file w32shell.c:
http://clisp.hg.sourceforge.net/hgweb/clisp/clisp/raw-file/363f5b952505/src/w32shell.c
which works like a charm for us.
it would be wonderful if we could shift the burden of maintaining it to you.

thanks!

-- 
Sam Steingold (http://sds.podval.org/) on CentOS release 5.6 (Final) X 
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