videoio(v4l2): fix build due missing V4L2_CID_ISO_SENSITIVITY

modules/videoio/src/cap_v4l.cpp

@@ -237,6 +237,11 @@ make & enjoy!
 #include <sys/videoio.h>
 #endif
 
+// https://github.com/opencv/opencv/issues/13335
+#ifndef V4L2_CID_ISO_SENSITIVITY
+#define V4L2_CID_ISO_SENSITIVITY (V4L2_CID_CAMERA_CLASS_BASE+23)
+#endif
+
 /* Defaults - If your board can do better, set it here.  Set for the most common type inputs. */
 #define DEFAULT_V4L_WIDTH  640
 #define DEFAULT_V4L_HEIGHT 480