[U-Boot] tools/Makefile: suppress "which swig" error output

[Tom Rini <trini@konsulko.com>]

On Sat, Nov 19, 2016 at 12:04:59PM +0000, Andre Przywara wrote:

> The Makefile in tools/ tries to find the "swig" utility by calling "which".
> If nothing is found in the path, some versions of which will print an error
> message:
> $ make clean
> which: no swig in (/usr/local/bin:/usr/bin:/bin)
> 
> This does not apply to all version of "which", though:
> $ echo $0
> bash
> $ type which
> which is aliased to `type -path'
> $ which foo				<== this version is OK
> $ /usr/bin/which foo			<== this one is chatty
> /usr/bin/which: no foo in (/usr/local/bin:/usr/bin:/bin)
> $ sh					<== make uses /bin/sh
> sh-4.3$ which foo			<== no alias here
> which: no foo in (/usr/local/bin:/usr/bin:/bin)
> 
> This error message is rather pointless in our case, since we just have
> this very check to care for this. So add stderr redirection to suppress
> the message.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> Reviewed-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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