build: update cubeb and remove the result_of comment
Cubeb doesn't use result_of anymore, it has been dropped in commit mozilla/cubeb@75d9d125ee655ef80f3bfcd97ae5a805931042b8
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Cubeb doesn't use result_of anymore, it has been dropped in commit mozilla/cubeb@75d9d125ee655ef80f3bfcd97ae5a805931042b8