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Don't see a need for this to be autoloaded, since it is only used in
gnus.el (in one place, as a fallback).  Maybe it should be obsolete?

* paths.el (gnus-default-nntp-server): Remove (gnus.el defines it).

* gnus/gnus.el (gnus-default-nntp-server): Make it a defcustom.
Merge in doc from paths.el version.