This improves REPL usage consistency across ports, by utilizing the pyexec
code for the unix REPL.
Only enabled when MICROPY_USE_READLINE == 1 (the default).
Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
When this variable is set to non-empty string it triggers the REPL after a
command/module/file finishes running.
The Python file without the file extension is because the cmdline: parser
in run-test splits on spaces, so we can't use the -c option since
`import os` can't be written without a space.