bug#41071: make-frame with internal-border face not working

[Eli Zaretskii]

> From: 王凯 <wangkai.kaiwk@bytedance.com>
> Date: Mon, 4 May 2020 15:30:09 +0800
> 
> (defface test
>   '((t (:inherit default :background "green")))
>   "Face used by the ivy-posframe."
>   :group 'ivy-posframe)
> 
> (set-face-background
> 'internal-border
> (face-attribute 'test :background)
> (make-frame `((internal-border-width . 100)
>                (parent-frame . ,(window-frame)))))
> 
> (set-face-background
> 'internal-border
> (face-attribute 'test :background)
> (make-frame `((internal-border-width . 100))))
> 
> Eval code above in emacs, internal-border-width works but the
> :background not.

It does here, so I guess this could be macOS specific.