[PATCH] Add read-wrapper REPL option

[David Thompson]

Guile-2D needs a REPL that runs within its event loop without blocking
when reading user input. Mark Weaver has helped me add a new REPL
option, read-wrapper, that can be used by Guile-2D to push the read
operation into another thread while the main thread's event loop
continues to run as normal. This avoids the problem of thread safety
with the normal REPL server.

I think that this could be useful for other programs that run in an
event loop. Perhaps Emacsy?

- Dave Thompson

0001-Add-read-wrapper-REPL-option.patch
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