libgcc updated from 8.2.1 to 9.2.1

[Florian Weimer]

* Nunziante Gaito via Gcc-help:

> In our application we are updated the libgcc from 8.2.1 to 9.2.1
> Do you see any problems or not backward compatibility cases?

libgcc and libgcc_s changes are expected to be backwards-compatible.

Thanks,
Florian
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