CI: Stop building on Ubuntu 14.04 'trusty'
The version of gcc in trusty is too old for AddressSanitizer, which we want to be able to start using, and Travis-CI finally supports Ubuntu 16.04 'xenial' now. This lets us remove some workarounds, but we need to update others. Signed-off-by: Simon McVittie <email@example.com>
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