RFR: 7062: Update to the Eclipse 2020-12 platform

[Marcus Hirt]

On Fri, 18 Dec 2020 15:28:08 GMT, Jie Kang <jkang at openjdk.org> wrote:

>> Oracle has already stated that they are considering releasing on 2020-06 (@guruhb - is this still the case?). Even if we take it (it does contain Big Sur-related fixes), vendors can decide which version they want to build and release on (i.e. -P<platform> when packaging).
>
> Yes, as downstream we can select a different release if need be; well it isn't necessarily in our hands with Fedora but anyways.

After playing around a bit more, there seems to be some problem with the Chromium based browser component on Windows when using 2020-12. I'm withdrawing this for now - the big sur fixes will have to wait.

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PR: https://git.openjdk.java.net/jmc/pull/185