MacOSX/VLC_app: Connect the Sound slider.

extras/MacOSX/VLC_app/Sources/VLCMainWindow.h

@@ -44,6 +44,8 @@
     IBOutlet NSTextField * mediaReadingProgressText;
     IBOutlet NSTextField * mediaDescriptionText;
 
+    IBOutlet NSSlider * mediaSoundVolume;
+
     IBOutlet id navigatorViewToggleButton;
     IBOutlet VLCOneSplitView * mainSplitView;
     IBOutlet NSView * navigatorView;

extras/MacOSX/VLC_app/Sources/VLCMainWindow.m

@@ -236,6 +236,9 @@
 
     [mainSplitView setDelegate:self];
 
+    /* Sound */
+    [mediaSoundVolume bind:@"value" toObject:[VLCLibrary sharedLibrary] withKeyPath:@"audio.volume" options: nil];
+
     /* Last minute setup */
     [categoriesListView expandItem:nil expandChildren:YES];
     [categoriesListView selectRowIndexes:[NSIndexSet indexSetWithIndex:[categoriesListView numberOfRows] > 0 ? [categoriesListView numberOfRows]-1 : 0] byExtendingSelection:NO];