Wrapping existing FILE *s as Lua file objects

["Reuben Thomas" <rrt@...>]

I can't see a way to do this after looking at liolib.c and googling a bit.  
It's obviously fairly trivial to extend liolib.c to do it, but a pain as  
you can't do it with vanilla Lua.

Am I missing something? I don't imagine it's that rare to want to pass a  
FILE * obtained from somewhere else into a Lua script without re-inventing  
the liolib wheel...

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