RFR: 8265400: Update to gcc 10.3 on Linux

Thu Apr 29 13:09:57 UTC 2021

On Thu, 29 Apr 2021 12:59:01 GMT, Johan Vos <jvos at openjdk.org> wrote:

> the entry says "gcc10.3.0-OL6.4+1.0" but I tested using the gcc10.3.0 on Ubuntu (18.04)

Yeah, the "OL6.4" part is just the name of the devkit (generated for the JDK builds), since that was their baseline. You can see it in the JDK 17 sources [here](https://github.com/openjdk/jdk/blob/713483c77d3007309a3e019218f1ad26453e7c28/make/conf/jib-profiles.js#L1049).

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PR: https://git.openjdk.java.net/jfx/pull/481