[U-Boot] Set time and umask on multi-dtb fit images to ensure reproducibile builds.

[Tom Rini]

On Sun, Jun 03, 2018 at 12:26:57PM -0700, Vagrant Cascadian wrote:

> When building compressed (lzop, gzip) multi-dtb fit images, the
> compression tool may embed the time or umask in the image.
> 
> Work around this by manually setting the time of the source file using
> SOURCE_DATE_EPOCH and a hard-coded 0600 umask.
> 
> With gzip, this could be accomplished by using -n/--no-name, but lzop
> has no current workaround:
> 
>   https://bugs.debian.org/896520
> 
> Signed-off-by: Vagrant Cascadian <vagrant at debian.org>

Applied to u-boot/master, thanks!

-- 
Tom
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