travis: the arm64 build doesn't like cpp-coveralls
travis: the arm64 build doesn't like cpp-coveralls

For some reason the Travis CI build is failing to pip install the
cpp-coveralls package so let's skip it (we don't run the coveralls
portions on arm64 anyway).

Signed-off-by: Paul Moore <a027184a55211cd23e3f3094f1fdc728df5e0500@paul-moore.com>

seccomp/libseccomp,seccomp/libseccomp,seccomp/libseccomp