macosx: Don't use a textured Window if we have the leopard window style.

Proposed by Georg Seifert.

modules/gui/macosx/embeddedwindow.m

@@ -41,6 +41,22 @@
 
 @implementation VLCEmbeddedWindow
 
+- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)windowStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation
+{
+    BOOL useTextured = YES;
+    if([[NSWindow class] instancesRespondToSelector:@selector(setContentBorderThickness:forEdge:)])
+    {
+        useTextured = NO;
+        windowStyle ^= NSTexturedBackgroundWindowMask;
+    }
+	self = [super initWithContentRect:contentRect styleMask:windowStyle backing:bufferingType defer:deferCreation];
+    if(!useTextured)
+    {
+        [self setContentBorderThickness:32.0 forEdge:NSMinYEdge];
+    }
+	return self;
+}
+
 - (void)awakeFromNib
 {
     [self setDelegate: self];