Severity: wishlist

The `easy-menu-remove' and `easy-menu-add' are XEmacs compatibility
aliases.  I think they do not make sense these days, and it is better
for code that wants to use them to wrap the call in something like
`(when (featurep 'xemacs) ...)'.

The attached patch makes them obsolete and fixes all callers.  It takes
care to not remove XEmacs compatibility from any modules where it was
not already removed, so I hope this will be uncontroversial.