bug#10371: Broken links in the on-line automake manual

The attached patch.gz fixes the urls in automake.texi, adds checklinkx to the contrib/ subdirectory, and a new target in doc/local.mk to invoke it for rechecking. Hearing no objection, I pushed this change (last night, belatedly sending this mail, sorry) and am closing this bug. -k

bug#10371: Broken links in the on-line automake manual

Hi Stefano and all -- back on your report about broken urls from 2011 :) -- Date: Mon, 26 Dec 2011 22:03:50 +0100 Feeding the address of the on-line automake manual: to the W3C linkchecker: