Doesn't compile after changes in Exiv2

[Taqras]

On Archlinux, with Exiv2 0.28.0, it will not compile:

src/gimplensfun.cpp: In function ‘int read_opts_from_exif(const char*)’:
src/gimplensfun.cpp:1037:19: error: ‘AutoPtr’ is not a member of ‘Exiv2::Image’
 1037 |     Exiv2::Image::AutoPtr Exiv2image;