[PATCHv2] tools: Stop re-defining -std= when building tools

[Tom Rini]

On Mon, Oct 11, 2021 at 11:11:41AM -0400, Tom Rini wrote:

> While we intentionally set -std=gnu11 for building host tools, and have
> for quite some time, we never dropped -std=gnu99 from tools/Makefile.
> This resulted in passing -std=gnu11 ... -std=gnu99 when building, and
> gnu99 would win.  This in turn would result now in warnings such as:
> tools/mkeficapsule.c:25:15: warning: redefinition of typedef 'u32' is a C11 feature [-Wtypedef-redefinition]
> typedef __u32 u32;
>               ^
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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