RFR(S): 8227578: Wrong JRE targets in Images.gmk after JDK-8219971

[Tim Bell]

Hi, Christoph:

> please review this little bugfix in Images.gmk.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8227578
> Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8227578.0/
>
> I guess it's only relevant when building "legacy-bundles" or something that builds jre-images. However in that case we observed intermittent build errors like can be seen here:
> https://ci.sapmachine.io/view/Pull%20Request%20Validation%20Builds%20/job/build-13-pr-validation-linux_x86_64/96/console
>
> Also, the CDS archive for a JRE build wouldn't be created correctly with the current version of Images.gmk, I guess.
>
> Planning to push to JDK13.

Looks good.

Tim