Remove ancient completely obsolete exif.c file, make exif.h dox-only
Remove ancient completely obsolete exif.c file, make exif.h dox-only

pestophagous/unofficial_scratchpad_git-cvsimport_libexif,pestophagous/unofficial_scratchpad_git-cvsimport_libexif,pestophagous/unofficial_scratchpad_git-cvsimport_libexif