[U-Boot] travis: Add sandbox/clang-7 support

[Tom Rini]

On Sun, Oct 07, 2018 at 02:20:30PM -0400, Tom Rini wrote:

> To make testing with clang support easier, add sandbox/clang-7
> combination to our testing matrix.  To facilitate this, switch to using
> the "sources" method that the travis.yml file supports to list
> additional repositories and add the official one for llvm-7.  Due to
> buildman not supporting using clang at this time add logic to manually
> build a single sandbox configuration in the expected output directory so
> that we can still invoke all of our tests.
> 
> Cc: Simon Glass <sjg at chromium.org>
> Signed-off-by: Tom Rini <trini at konsulko.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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