[U-Boot] [PATCH] Makefile: Ensure we build with -std=gnu11

[Joakim Tjernlund]

On Tue, 2018-06-19 at 23:57 -0400, Tom Rini wrote:
> 
> 
> With the move to using at least gcc-6 for many targets we now have C
> code that requires the GNU11 C standard to be used in all cases.

Requiring gcc-6 is a bit much I think, there are lots of cross gcc's out there
that is older. I don't think even the kernel needs gcc-6

 Jocke