Patch for install-sh; adds support for -C option

[Marcel Loose]

Hi,
 
I was wondering why install-sh does not support the BSD install -C option 
(install file, unless target already exists and is the same as the new file). I 
consider this option quite useful, especially since automake uses install-sh 
whenever you install header files prefixed with nobase_ (see my bug report in 
GNATS database, #475). So, I cooked up this patch (see attachment) for 
install-sh. I have no idea whether it meets your quality standards, since this 
is the very first patch I'm uploading. Please send feedback (positive or 
negative), so I can learn.
 
Kind regards,
 
Marcel Loose.

install-sh.patch
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