configure: check for lablgtk2.sourceview2 first
configure: check for lablgtk2.sourceview2 first

jpdeplaix/why3,ssaavedra/why3,douglas-larocca/why3,douglas-larocca/why3,jpdeplaix/why3,jpdeplaix/why3,ssaavedra/why3,ssaavedra/why3,douglas-larocca/why3