RFR: 8252191: Update to gcc 10.2 on Linux

Thu Oct 8 12:48:46 UTC 2020

On Thu, 8 Oct 2020 11:35:15 GMT, Eric Bresie <github.com+370894+ebresie at openjdk.org> wrote:

>>> What OS are you using? (I'm running a test on Ubuntu 18.04)
>> 
>> I also have 18.04.
>
> Does the [documentation](https://wiki.openjdk.java.net/display/OpenJFX/Building+OpenJFX) need updating to reflect the
> change?

The Wiki doesn't specify the version of gcc (it probably should, though).

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PR: https://git.openjdk.java.net/jfx/pull/311