Elimination of Howl backend for bonjour prpl

[Daniel Atallah]

There are now 3 implemenations of the mdns functionality for the bonjour
prpl: Avahi, Howl and DnsSD (Apple Bonjour) (only used on win32).

At this point, since Howl has been discontinued for quite a while, and
because I don't want to have to maintain it, I'm planning to eliminate the
Howl implementation for the next release from the im.pidgin.pidgin branch.

There are a number of things that don't work correctly in it right now (for
example, it doesn't receive updates and buddy icons are not supported).

Does anyone have a compelling reason why this shouldn't be done?

-D
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