[U-Boot] common: main.c: make show_boot_progress __weak

[Tom Rini]

On Thu, Jun 26, 2014 at 08:18:31PM +0200, Jeroen Hofstee wrote:

> This not only looks a bit better it also prevents a
> warning with W=1 (no previous prototype).
> 
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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