[patch/rebase] Fix build problems in imagehelper

[Jason Tishler]

Corinna,

On Mon, Jun 20, 2011 at 05:25:59PM +0200, Corinna Vinschen wrote:
> Ok to apply?

I would like to give Chuck a chance to apply the following patch that he
had already submitted (so it applies cleanly):

* autoconfify rebase and imagehelper
* make peflagsall and rebaseall set PATH to
    (dir-of-$0):(configured $bindir):/bin
  for better relocate-ability.
* fix a number of warnings related to deprecated cygwin functions;
  use cygwin_create_path rather than cygwin_conv_, if available. (1)
* add some fixes/workarounds for MSYS
* some accommodations to use explicitly 'dash' rather than 'ash',
  if desired.
* Add explicit COPYING file for GPLv2.
* Update build.sh to accommodate MinGW and MSYS, as well as Cygwin.
* Add getopt_long implementation to workaround broken impl on MSYS
  (only built if $host=MSYS)

Is that OK?

Thanks,
Jason

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