video_output: don't include control.h in include shared across the core

They don't need to know about it.

src/video_output/control.c

@@ -27,6 +27,7 @@
 #include <vlc_common.h>
 #include <vlc_vout.h>
 #include "vout_internal.h"
+#include "control.h"
 
 /* */
 void vout_control_cmd_Init(vout_control_cmd_t *cmd, int type)

src/video_output/vout_internal.h

@@ -47,7 +47,6 @@ typedef struct {
     vlc_mouse_event      mouse_event;
     void                 *mouse_opaque;
 } vout_configuration_t;
-#include "control.h"
 
 /**
  * Creates a video output.