New package: _autorebase. Call rebaseall after installing new or updated DLLs

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

I've added a new package called _autorebase to the Cygwin distro.

This package is usually installed and updated automatically.  In the
default view of setup.exe you won't even see it.

The purpose of this package is to run rebaseall automatically after any
package containing DLLs is updated.

Please note that the _autorebase.sh postinstall script might run a few
minutes.  Don't be alarmed if the postinstall takes that long now.  It's
not because the _autorebase.sh script hangs, but because rebaseall might
take that long.  In my private testing scenario it could take a couple
of seconds up to two minutes.

Please also note that this package requires at least the new rebase
version 4.1.0.  The changes in rebase 4.1.0 deal gracefully with DLLs
which are in use while rebaseall runs.  Without these changes the
automatic call to rebaseall from the _autorebase package will fail and
you have to run rebaseall manually again.


To update your installation, click on the "Install Cygwin now" link on
the http://cygwin.com/ web page.  This downloads setup.exe to your
system.  Then, run setup and answer all of the questions.


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-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat