[11u] RFR Backport: 8221610: Resurrect (legacy) JRE bundle target

[Langer, Christoph]

Hi,

I'd like to backport the resurrection of the legacy JRE bundle target to jdk11 updates because it would help a lot in our build infrastructure. Maybe other downstream vendors can take profit of this, too.

The patch doesn't apply cleanly, so I had to resolve a bit. Please review my changes.
Bug: https://bugs.openjdk.java.net/browse/JDK-8221610
Original commit: http://hg.openjdk.java.net/jdk/jdk/rev/f062188117ad
Backport Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8221610.jdk11u-dev.0/

Modifications I had to make:
make/Bundles.gmk -> copyright year
make/Main.gmk -> ALL_TARGETS += product-bundles legacy-bundles ... needed some resolving

Thanks
Christoph