[FS#814] When LEDE is compiled with GCC 7 on at least ar71xx and brcm47xx, Dropbear won't accept connections

[LEDE Bugs]

The following task has a new comment added:

FS#814 - When LEDE is compiled with GCC 7 on at least ar71xx and brcm47xx, Dropbear won't accept connections
User who did this - Kevin Darbyshire-Bryant (kdarbyshirebryant)

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Two patches authored today (22 Aug 17) to bump gcc 7 to 7.2.0 (https://patchwork.ozlabs.org/patch/804368/) and also one that removes a MIPS 'optimization' patch https://patchwork.ozlabs.org/patch/804367/

The removal of '300-mips_Os_cpu_rtx_cost_model.patch' has solved the dropbear '-Os' failure for me with no apparent size penalty.  It would be worth testing again with those patches applied.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=814#comment3279