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Ignore libedit/libreadline while probing for standard functions.
Some versions of libedit expose bogus definitions of setproctitle(),optreset, and perhaps other symbols that we don't want configure to pick upon. There was a previous report of similar problems with strlcpy(), whichwe addressed in commit59cf88d, but theproblem has evidently grown in scope since then. In hopes of not having todeal with it again in future, rearrange configure's tests for suppliedfunctions so that we ignore libedit/libreadline except when probingspecifically for functions we expect them to provide.Per report from Christoph Berg, though this is slightly more aggressivethan his proposed patch.1 parent1a5f04d commit2666a6d
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