[bug-mailutils] Building against readline 6.3

[Martin von Gagern]

Hi!

Mailutils 2.99.98 fails to build against readline 6.3 because the
CPPFunction typedef was removed. One way to resolve the issue is
removing all the explicit casts to (CPPFunction*) since these seem to
work well enough implicitely. Another way is renaming the type used in
the cast to (rl_completion_func_t*) which is the newer name.

I first reported this at https://bugs.gentoo.org/show_bug.cgi?id=503954
where you will also find a patch removing the casts in three code lines.

Greetings,
 Martin von Gagern

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