[FS#909] runas wrapper executes programs using wrong interpreter

[LEDE Bugs]

The following task has a new comment added:

FS#909 - runas wrapper executes programs using wrong interpreter
User who did this - Jo-Philipp Wich (jow-)

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Not preserving argv[0] will break cache at least.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=909#comment2985