vout: remove unreachable GET_OPENGL controls

This control is only useful if the video output is called "opengl".

modules/video_output/caopengllayer.m

@@ -334,12 +334,6 @@ static int Control (vout_display_t *vd, int query, va_list ap)
             return VLC_SUCCESS;
         }
 
-        case VOUT_DISPLAY_GET_OPENGL:
-        {
-            vlc_gl_t **gl = va_arg (ap, vlc_gl_t **);
-            *gl = &sys->gl;
-            return VLC_SUCCESS;
-        }
         case VOUT_DISPLAY_CHANGE_WINDOW_STATE:
         {
             return VLC_SUCCESS;

modules/video_output/gl.c

@@ -272,7 +272,7 @@ static int Control (vout_display_t *vd, int query, va_list ap)
         vlc_gl_ReleaseCurrent (sys->gl);
         return VLC_SUCCESS;
       }
-
+#if !USE_OPENGL_ES
       case VOUT_DISPLAY_GET_OPENGL:
       {
         vlc_gl_t **pgl = va_arg (ap, vlc_gl_t **);
@@ -280,7 +280,7 @@ static int Control (vout_display_t *vd, int query, va_list ap)
         *pgl = sys->gl;
         return VLC_SUCCESS;
       }
-
+#endif
       default:
         msg_Err (vd, "Unknown request %d", query);
     }

modules/video_output/ios2.m

@@ -314,13 +314,6 @@ static int Control(vout_display_t *vd, int query, va_list ap)
             return VLC_SUCCESS;
         }
 
-        case VOUT_DISPLAY_GET_OPENGL:
-        {
-            vlc_gl_t **gl = va_arg(ap, vlc_gl_t **);
-            *gl = &sys->gl;
-            return VLC_SUCCESS;
-        }
-
         case VOUT_DISPLAY_RESET_PICTURES:
             assert (0);
         default:

modules/video_output/macosx.m

@@ -384,13 +384,6 @@ static int Control (vout_display_t *vd, int query, va_list ap)
             return VLC_SUCCESS;
         }
 
-        case VOUT_DISPLAY_GET_OPENGL:
-        {
-            vlc_gl_t **gl = va_arg (ap, vlc_gl_t **);
-            *gl = &sys->gl;
-            return VLC_SUCCESS;
-        }
-
         case VOUT_DISPLAY_RESET_PICTURES:
             assert (0);
         default: