[Rev 01] RFR: 6744: Adding Eclipse RCP 2020-03 platform

[Marcus Hirt]

On Fri, 27 Mar 2020 15:06:57 GMT, Jie Kang <jkang at openjdk.org> wrote:

>> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Switching to 2019-12 as default until Fedora crash is properly investigated
>
> Changes here worked for me. I wonder if the PR should re-target a different issue in JMC Jira, or maybe a new PR be
> opened (dunno how the bot will react). At your discretion :)

Turning this issue into adding the platform. Cloned an issue for switching to 2020-03 as default, blocking on JMC-6749.

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PR: https://git.openjdk.java.net/jmc/pull/69