[m-dev.] for review: add promise_only_solution/1 to builtin.m ;-)

[Mark Anthony BROWN]

Hi,

> Estimated hours taken: 0.5
> 
> library/builtin.m:
> 	Add `promise_only_solution/1'.
> 
> NEWS:
> 	Mention this addition.
> 
> Index: NEWS
> ===================================================================

[...]

> +* There is also a new builtin function promise_only_soln/1,

s/soln/solution/

Cheers,
Mark
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