Revert "camera import: don't compile it by default, it's dangerous."

This reverts commit ea276e40e0e4aa7d77c839aaa629b48e13f12529.
(cherry picked from commit 484e52030c7b56eea0c6ccdcf51d0457aeae6fea)
Removes support for deleting images from camera.

This option has proved to be dangerous and should anyway never be used.
It is far safer to keep the pictures on the sd/xd/cf card and letting
time to develop and put the pictures on a safe storage (RAID, external
storage service...). Then when a card is to be reused it can be formatted
on the camera.
(cherry picked from commit b462992410cabc0502fc72e9d24698da5864d5ae)