The files() function generates a variable with the location of the
referenced files.
This is shorter than joining the current_source_dir() of which use is
somewhat frowned upon.
Fixes: 90de3690c4 ("libcamera: Auto-generate libcamera.h")
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>