[U-Boot] mkimage: fix argument parsing on BSD systems

[Tom Rini]

On Sun, May 01, 2016 at 03:01:27AM +0200, Andreas Bießmann wrote:

> The getopt(3) optstring '-' is a GNU extension which is not available on BSD
> systems like OS X.
> 
> Remove this dependency by implementing argument parsing in another way. This
> will also change the lately introduced '-b' switch behaviour.
> 
> Signed-off-by: Andreas Bießmann <andreas.devel at googlemail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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