[U-Boot] kbuild: add user-supplied CPPFLAGS, AFLAGS and CFLAGS

[Tom Rini]

On Tue, Apr 15, 2014 at 02:47:40PM +0900, Masahiro Yamada wrote:

> Like Linux Kernel, this commit provides environment variables
> KCPPFLAGS, KAFLAGS and KCFLAGS, which are useful to pass
> additional options.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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