[gtk-mac-integration] Prevent "doesn't implement NSApplicationDelegate" error

[John Ralls <jralls src gnome org>]

commit 37a852198290d96a54333781e235dccf7db8d24b
Author: John Ralls <jralls ceridwen us>
Date:   Thu Sep 26 13:44:46 2013 -0700

    Prevent "doesn't implement NSApplicationDelegate" error
    
    When building with OSX 10.6 and later.

 src/GNSMenuDelegate.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/GNSMenuDelegate.h b/src/GNSMenuDelegate.h
index 08b074f..28f3cd4 100644
--- a/src/GNSMenuDelegate.h
+++ b/src/GNSMenuDelegate.h
@@ -1,5 +1,9 @@
 #import <Cocoa/Cocoa.h>
 #include <gtk/gtk.h>
 
+#if (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_6)
+ interface _GNSMenuDelegate : NSObject <NSMenuDelegate> {}
+#else
 @interface _GNSMenuDelegate : NSObject {}
+#endif
 @end