[PATCH] Another setup.exe infinite loop in unattended mode.

[Dave Korn]

    Hi,

  I found another one.  In unattended mode, if the setup.ini download or
signature verification fails, we can loop forever trying again, because
there's no user to select a different mirror.  A parallel problem exists if we
try and install from a local package dir with no or a corrupt setup.ini file.
 The first case is worth retrying a few times, because it might just be a
network glitch; the second not.

  (Note that this all only kicks in if *all* the selected mirrors / local
package dir setup.ini files are invalid.)

	* threebar.cc (ThreeBarProgressPage::OnMessageApp): Don't loop forever
	retrying ini file download/parse if it errors in unattended mode.

  Ok?

    cheers,
      DaveK
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