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

[Jonah Graham]

On Thu, 17 Dec 2020 01:20:46 GMT, Jonah Graham <github.com+679236+jonahgraham at openjdk.org> wrote:

>> releng/platform-definitions/platform-definition-2020-12/platform-definition-2020-12.target line 55:
>> 
>>> 53:             <unit id="org.eclipse.pde.feature.group" version="3.14.600.v20201202-1800"/>
>>> 54:             <unit id="org.eclipse.platform.sdk" version="4.18.0.I20201202-1800"/>
>>> 55:             <repository location="http://download.eclipse.org/releases/2020-12/"/>
>> 
>> Try using https:// to workaround the http -> https redirect issue at download.eclipse.org.
>
> Sorry I had hoped the problem was only http to https redirects. We'll need webmaster at eclipse.org to fix it. My guess is the fix for https://bugs.eclipse.org/bugs/show_bug.cgi?id=569730 broke it, so you can follow along there. 
> 
> Sorry for the inconvenience.

Can you retrigger your build? IIUC the badly behaved redirect has been resolved.  https://bugs.eclipse.org/bugs/show_bug.cgi?id=569765

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