clients: fix build on Linux

Cannot find out why stropts.h is needed and Linux doesn't support
streams anyway, so there is no stropts.h.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>

clients/simple-dmabuf-v4l.c

@@ -34,7 +34,6 @@
 
 #include <drm_fourcc.h>
 
-#include <stropts.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <fcntl.h>