macosx: fix crash occuring while initializing the info panel

It is not allowed to call [[VLCMain sharedInstance] info]
on the non-main-thread, as this might load and initialize the
info window.

(cherry picked from commit d87928927015fad3cdbcd0309bf3185c3672822f)
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

modules/gui/macosx/intf.m

@@ -367,7 +367,9 @@ static int InputEvent(vlc_object_t *p_this, const char *psz_var,
             [[VLCMain sharedInstance] performSelectorOnMainThread:@selector(updateMainWindow) withObject: nil waitUntilDone: NO];
             break;
         case INPUT_EVENT_STATISTICS:
-            [[[VLCMain sharedInstance] info] performSelectorOnMainThread:@selector(updateStatistics) withObject: nil waitUntilDone: NO];
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [[[VLCMain sharedInstance] info] updateStatistics];
+            });
             break;
         case INPUT_EVENT_ES:
             break;