[patch] a new setup.exe parameter to specify packages

[Kohsuke Kawaguchi]

Hi,

I wrote a patch for setup.exe so that it can take a list of packages
to be installed via the -P option, like this:

  setup.exe -P openssh,cvs,subversion

This would bring in the 3 modules and all their dependencies (of the
curr version.) The main use case for this is to perform unattended
installation from CLI.

I tried to make the coding style match with that of choose.cc, even
though the coding style of setup.exe as a whole seems to be different
from choose.cc. This is the first time I write a patch for Cygwin, so
my apologies if I'm missing some requirements.

-- 
Kohsuke Kawaguchi 
http://weblogs.java.net/blog/kohsuke/
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