Moved BBSystemAppDelegate to system.h. Resolves #162

systemdefault.mod/system.h

@@ -34,6 +34,11 @@ void bbSystemEmitOSEvent( HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam,BBObjec
 
 #ifdef __OBJC__
 #include <AppKit/AppKit.h>
+
+@interface BBSystemAppDelegate : NSObject{
+}
+@end
+
 #else
 typedef void *NSView;
 typedef void *NSEvent;

systemdefault.mod/system.macos.m

@@ -66,10 +66,6 @@ typedef struct AsyncOp{
 	BBObject *syncInfo;
 }AsyncOp;
 
-@interface BBSystemAppDelegate : NSObject{
-}
-@end
-
 static BBSystemAppDelegate *appDelegate;
 
 static NSString *tmpNSString( BBString *str ){