Update lensfun to version 0.3.0. It contains few changes making consumer
code incompatible with earlier versions; particularly, removal of CCI (the
Color Contribution Index of the lens, as defined by ISO 6728-83)  and
FOV1 ("field-of-view")  distortion model.
Four ports had to be patched to build against new lensfun (all fall under
`graphics' category): digikam-kde4, gimp-lensfun-plugin, hugin, rawstudio.
Submitted by: Matthieu Volat (heavily modified)
Exp-run by: antoine