> - save the current variable contents in hashwalk_init (OC_WALKINIT)
> - restore previous variable contents in OC_WALKDONE

A friend pointed me to the fact, that there are even more differences
between awk versions (even gawk). Some versions restore the for-in loop
variable contents others don't. Current gawk versions doesn't seem to
restore the loop variable contents (only the walker list).
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