travis: Parse configure.ac to pick an updated LIBDRM_VERSION.
Travis has been broken a couple of times by configure.ac updates. To make it useful, auto-update the version necessary. This could potentially be used for other dependencies, too, but those get bumped less frequently. Reviewed-by: Emil Velikov <email@example.com> Reviewed-by: Rhys Kidd <firstname.lastname@example.org>
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