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

[Marcus Hirt]

On Mon, 21 Dec 2020 16:08:05 GMT, Jie Kang <jkang at openjdk.org> wrote:

>> 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.

Oops. Thanks!

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