modules/gnome: deprecate yelp variadic sources

Yelp currently can take sources two different ways, the first is via
variadic arguments, the second is by a keyword argument. If the keyword
is passed then the variadic arguments are silently ignored, which is
obviously not ideal. Fortunately the variadic form was never documented,
and is likely not in wide use.

This patch fixes it by deprecating the variadic form, and warning if
both are passed. It does not change behavior as someone may be relying
on it.

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