[U-Boot] travis-ci: Add swig and libpython-dev to the package list

[Tom Rini]

On Mon, Jan 23, 2017 at 05:40:22PM -0500, Tom Rini wrote:

> As part of 1905c8fc711a we introduced failures depending on if swig and
> libpython-dev are installed or not.  To provide coverage for this are of
> code in the future ensure we have these packages installed.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>
> Reviewed-by: Heiko Schocher <hs at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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