configure: use inf/wrn/err functions to write messages for the user.
(Patch by Adrien Nader!) This makes messages to the user more consistent. Behaviours: inf(): writes its arguments to stderr wrn(): writes "[WARNING]" to stderr and then its arguments to stderr err(): writes "[ERROR!]" to stderr, then its arguments to stderr, and calls "exit 2" git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13841 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02master
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