[U-Boot] Respect SOURCE_DATE_EPOCH when building FIT images.

[Tom Rini]

On Thu, Jun 16, 2016 at 12:28:40PM -0700, Vagrant Cascadian wrote:

> Embedding timestamps in FIT images results in unreproducible builds
> for targets that generate a fit image, such as dra7xx_evm.
> 
> This patch uses the SOURCE_DATE_EPOCH environment variable, when set,
> to use specified value for the date.
> 
> Thanks to HW42 for debugging the issue and providing the patch:
> 
>   https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160606/005722.html
> 
> For more information about reproducible builds and the
> SOURCE_DATE_EPOCH specification:
> 
>   https://reproducible-builds.org/specs/source-date-epoch/
>   https://reproducible-builds.org/
> 
> Signed-off-by: Vagrant Cascadian <vagrant at debian.org>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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