cygwin install override files

[Darren Tucker]

Roumen Petrov wrote:
> The install from contrib/cygwin/Makefile will override files. See 
> attached diff file "cygwin-Makefile.diff".

I think you meant "overwrite", and after I realised that your patch was 
reversed it made perfect sense :-)

There's a couple of removals that need not have been removed so I've 
fixed them instead and committed it.

Thanks.

-- 
Darren Tucker (dtucker at zip.com.au)
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