* include/gphoto2-[camera,frontend].h
* libgphoto2/[camera,frontend].c: gp_frontend_message ->
gp_camera_message
* camlibs: Reflect above
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@2440 67ed7778-7388-44ab-90cf-0a291f65f57c