[U-Boot] common: Delete unnecessary rules.

[Tom Rini]

On Mon, Nov 18, 2013 at 04:24:58PM +0900, Masahiro Yamada wrote:

> The directory tools/ is always built before common/.
> So when envcrc tool is necessary in common/Makefile,
> it already exists.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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