Support text-shadow on for Emacs face

[stardiviner]

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I found an patch (https://github.com/ksqsf/emacsmoe/pull/1/files) for Emacs on 
macOS.

Is it possible to let Emacs support this by default for Linux system?

I hope Emacs can implement this feature. It make Emacs more feasible of looks 
awesome.

- -- 
[ stardiviner ]
       I try to make every word tell the meaning that I want to express.

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