macosx: Make sure we can move the window by clicking in its background.

Regression if I recall well.

modules/gui/macosx/embeddedwindow.m

@@ -70,6 +70,8 @@
     [o_btn_fullscreen setState: NO];
     b_fullscreen = NO;
 
+    [self setMovableByWindowBackground:YES];
+
     [self setDelegate:self];
 
     /* Make sure setVisible: returns NO */

modules/gui/macosx/vout.m

@@ -912,6 +912,11 @@ int DeviceCallback( vlc_object_t *p_this, const char *psz_variable,
     o_embeddedwindow = [self window];
 }
 
+- (BOOL)mouseDownCanMoveWindow
+{
+    return YES;
+}
+
 - (id)initWithFrame: (NSRect)frameRect
 {
     if(self = [super initWithFrame: frameRect])

modules/gui/macosx/voutgl.m

@@ -404,6 +404,11 @@ static void Unlock( vout_thread_t * p_vout )
     return self;
 }
 
+- (BOOL)mouseDownCanMoveWindow
+{
+    return YES;
+}
+
 - (void) reshape
 {
     int x, y;