[FS#830] No SSH Access to Device TP-Link MR3420 V2 (even in failsafe)

[LEDE Bugs]

The following task has a new comment added:

FS#830 - No SSH Access to Device TP-Link MR3420 V2 (even in failsafe)
User who did this - nouman8 (nouman8)

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how to set -Os flag to -O2 ?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=830#comment2767