Comment # 20 on bug 4293 from Nicolas Chauvet

(In reply to Ben Rosser from comment #19)
> Awesome, thanks for finishing the review!
> 
> When I asked about BR: coreutils I was told it was "up to the packager's
> discretion", so yeah, sadly there isn't a firm guideline here.
coreutils is part of the default group of packages populated for a build.
as seen in "koji show-groups f26-build"
So you can avoid listing it in BR. Only gcc is an exception because it would
avoid a dependency on gcc for noarch build.