[FS#188] 6in4: busybox/ local regression

[LEDE Bugs]

The following task has a new comment added:

FS#188 - 6in4: busybox/ local regression
User who did this - Stefan Lippers-Hollmann (slh)

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As a quick clarification, I only removed the local declaration from the subshell invocation in proto_6in4_update() (line 14), no other changes.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=188#comment482