libdc1394: fix S!=B failure

Fixes:
fatal error: dc1394/camera.h: No such file or directory
|  #include <dc1394/camera.h>
|                            ^
| compilation terminated.

Signed-off-by: Tim Orling <TicoTimo@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>