RFR: 8252191: Update to gcc 10.2 on Linux

Thu Oct 8 11:37:45 UTC 2020

On Tue, 6 Oct 2020 13:14:05 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

>> Marked as reviewed by jvos (Reviewer).
>
>> 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?

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