Andrew Siplas 5e895b28c7 FS-11444: Capture return code from os.execute(); stop attempting to concat boolean/nil to error string.
os.execute() returns [3
variables](f59e6a93c0/lauxlib.c (L286)).
Capture the 2nd (e.g. "exit") and 3rd (e.g. 0) in addition to the first
which would be merely `true` on success or `nil` on error.
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