* libgphoto2/gphoto2-camera.[c,h]: Add a pre_func and a post_func
that gets called before and after each access to the camera driver.
* camlibs/konica/library.c: Use above functions.
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@3138 67ed7778-7388-44ab-90cf-0a291f65f57c
a7b434e192