[O] lexical binding breaks org-font-lock-set-keywords-hook

[mc]

Hello, 

may I ask, how one would possibly access  and set the formerly dynamically 
bound variable 

`org-font-lock-extra-keywords'

as this is still recommended by the doc-string of 
org-font-lock-set-keywords-hook

now that org.el was switched to lexical binding by commit 1f49e9fd  01/10/2016 
01:29 AM ?

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