[U-Boot] [PATCH][RFC] Update U-Boot's build timestamp on every compile

[Peter Tyser]

Hi Wolfgang,

> Note that I'm not against this in principle. But if it gets changed,
> then not only for a single architecture, but everywhere.
> 
> > Cost: $0.00.  Benefit: $0.02.  Benefit/Cost = priceless.
> 
> Cost: work to implement, review and test.  Benefit: $0.02.
> Benefit/Cost = small ;-)

This PATCH/RFC was only meant as a quick example per the original email
comments.  It sounds like the patch would be worthwhile (let me know if
I'm mistaken) so I'll go ahead and create a proper patch updating
__TIME__/__DATE__ where relevant.

Thanks,
Peter