[U-Boot] tools: env: allow to print U-Boot version

[Tom Rini]

On Thu, Oct 26, 2017 at 02:57:53PM +0200, Stefan Agner wrote:

> From: Stefan Agner <stefan.agner at toradex.com>
> 
> The fw_env utility family has a default environment compiled in
> which ties it quite strongly to the U-Boot source/config it has
> been built with. Allow to display the U-Boot version it has been
> built with using the -v/--version argument.
> 
> Signed-off-by: Stefan Agner <stefan.agner at toradex.com>
> Reviewed-by: Lukasz Majewski <lukma at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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