Add option to which allows to handle truncated frames. (#289)

Extension of c96559e4ac.
Some cheap Chinise cameras produces frames which are detected as 'broken'. However they
are later handled well.
Introduce an option which allows disable the check on demand.

src/libs/capture.h

@@ -119,6 +119,7 @@ typedef struct {
 	uint				timeout;
 	us_controls_s 		ctl;
 	us_capture_runtime_s *run;
+    bool                allow_truncated_frames;
 } us_capture_s;