Backport to all branches #25
Description
Now that the RISC-V port has been accepted upstream, it would be nice to backport it to all (active) branches. I have already prepared backports to jdk-18, jdk-17 and jdk-16, but they need to be verified properly. I have also backports of the original RISC-V support all the way back to jdk-11, which has been sucessfully used for building most of the java packages in openSUSE Tumbleweed. All those backports are available from https://build.opensuse.org/project/show/home:Andreas_Schwab:riscv:java. Unfortunately, I couldn't get the backport attempt to jdk-10 working so far.