configure.ac: Fix publican version check
This sure is ugly - we feed output of publican -v into bc to compare against minimum required version, 2.8. That's bad enough, but when publican suddenly report 3.0.0, bc starts complaining... Use sed to filter out 3.0 from the 'version=3.0.0' output from publican instead. Seem a little more robust, but it's just a matter of time before something else breaks this flaky setup. Hey, publican, how about shipping .pc files?
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