Added right/other drag code for Cocoa windows

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402004

src/video/cocoa/SDL_cocoawindow.h

@@ -55,6 +55,8 @@ typedef struct SDL_WindowData SDL_WindowData;
 -(void) otherMouseUp:(NSEvent *) theEvent;
 -(void) mouseMoved:(NSEvent *) theEvent;
 -(void) mouseDragged:(NSEvent *) theEvent;
+-(void) rightMouseDragged:(NSEvent *) theEvent;
+-(void) otherMouseDragged:(NSEvent *) theEvent;
 -(void) scrollWheel:(NSEvent *) theEvent;
 -(void) keyDown:(NSEvent *) theEvent;
 -(void) keyUp:(NSEvent *) theEvent;

src/video/cocoa/SDL_cocoawindow.m

@@ -218,6 +218,16 @@ static __inline__ void ConvertNSRect(NSRect *r)
     [self mouseMoved:theEvent];
 }
 
+- (void)rightMouseDragged:(NSEvent *)theEvent
+{
+    [self mouseMoved:theEvent];
+}
+
+- (void)otherMouseDragged:(NSEvent *)theEvent
+{
+    [self mouseMoved:theEvent];
+}
+
 - (void)scrollWheel:(NSEvent *)theEvent
 {
     int index;