RFR: 7062: Update to the Eclipse 2020-12 platform [v2]

[Jie Kang]

On Mon, 21 Dec 2020 12:37:05 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Also updating the babel bundles for the 2020-09 platform.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use 2020-09 as default until problems resolved

releng/platform-definitions/platform-definition-2020-09/.project line 3:

> 1: <?xml version="1.0" encoding="UTF-8"?>
> 2: <projectDescription>
> 3: 	<name>platform-definition-2020-12</name>

I think this needs to be 09 again with another .project file added to the 2020-12 folder.

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