Removed useless vlc_thread_set_priority() calls in macosx code.

The thread are already created with the right priority. If not, then
vlc_clone() should be fixed instead.
Also, the vlc_thread_set_priority() calls on the main interface thread
seem bogus, as the target thread is dedicated to monitor the libvlc
death and is not the main running thread.

modules/gui/macosx/controls.m

@@ -869,8 +869,6 @@
     assert([data isKindOfClass:[VLCAutoGeneratedMenuContent class]]);
     VLCAutoGeneratedMenuContent *menuContent = (VLCAutoGeneratedMenuContent *)data;
 
-    vlc_thread_set_priority( VLCIntf , VLC_THREAD_PRIORITY_LOW );
-
     p_object = [menuContent vlcObject];
 
     if( p_object != NULL )

modules/gui/macosx/intf.m

@@ -117,11 +117,6 @@ static void Run( intf_thread_t *p_intf )
 {
     sigset_t set;
 
-    /* Do it again - for some unknown reason, vlc_thread_create() often
-     * fails to go to real-time priority with the first launched thread
-     * (???) --Meuuh */
-    vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_LOW );
-
     /* Make sure the "force quit" menu item does quit instantly.
      * VLC overrides SIGTERM which is sent by the "force quit"
      * menu item to make sure deamon mode quits gracefully, so
@@ -565,8 +560,6 @@ static VLCMain *_o_sharedMainInstance = nil;
 
     [o_controls setupVarMenuItem: o_mi_add_intf target: (vlc_object_t *)p_intf
         var: "intf-add" selector: @selector(toggleVar:)];
-
-    vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_LOW );
 }
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
@@ -1613,8 +1606,6 @@ static void manage_cleanup( void * args )
 
     /* new thread requires a new pool */
 
-    vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_LOW );
-
     p_playlist = pl_Get( p_intf );
 
     var_AddCallback( p_playlist, "item-current", PlaylistChanged, self );

modules/gui/macosx/playlist.m

@@ -1520,7 +1520,6 @@
 - (IBAction)addNode:(id)sender
 {
     playlist_t * p_playlist = pl_Get( VLCIntf );
-    vlc_thread_set_priority( p_playlist, VLC_THREAD_PRIORITY_LOW );
 
     PL_LOCK;
     playlist_NodeCreate( p_playlist, _("Empty Folder"),

modules/gui/minimal_macosx/intf.m

@@ -125,11 +125,6 @@ static void Run( intf_thread_t *p_intf )
 {
     sigset_t set;
 
-    /* Do it again - for some unknown reason, vlc_thread_create() often
-     * fails to go to real-time priority with the first launched thread
-     * (???) --Meuuh */
-    vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_LOW );
-
     /* Make sure the "force quit" menu item does quit instantly.
      * VLC overrides SIGTERM which is sent by the "force quit"
      * menu item to make sure deamon mode quits gracefully, so