[Skiboot] [PATCH] Add Travis configuration

[Stewart Smith]

Joel Stanley <joel at jms.id.au> writes:
> This will allow Travis CI (https://travis-ci.org) to build the firmware
> and run the test suite. In the future we can also use it to run and
> publish the results of scan-build and lcov.
>
> Travis build environments are stuck back on 12.04, so we don't have a
> powerpc cross compiler as part of the archive. Instead download one from
> kernel.org and use that.
>
> The 'make check' tests rely on newer -Wstack-usage flags that are not
> present on the old version of gcc shipped with 12.04. Install 4.8 from
> the toolchain ppa and set it to be the system default.
>
> The tests also require valgrind, so include that in the VM environment.
>
> Signed-off-by: Joel Stanley <joel at jms.id.au>

Thanks, merged!