Added some missing import statements.

Reviewed by me.

Tools/nib2cib/NSAppKit.j

@@ -32,6 +32,7 @@
 @import "NSCustomObject.j"
 @import "NSCustomResource.j"
 @import "NSCustomView.j"
+@import "NSEvent.j"
 @import "NSFont.j"
 @import "NSIBObjectData.j"
 @import "NSImageView.j"

Tools/nib2cib/NSMenuItem.j

@@ -22,6 +22,7 @@
 
 @import <AppKit/CPMenuItem.j>
 
+@import "NSEvent.j"
 @import "NSMenu.j"