appcds does not work with Java 8 OpenJDK for macOS ARM

[kkinnear]

When using this OpenJDK, downloaded from the AZUL site:

 % java -version
openjdk version "1.8.0_275"
OpenJDK Runtime Environment (Zulu 8.50.0.1017-CA-macos-aarch64) (build 1.8.0_275-b01)
OpenJDK 64-Bit Server VM (Zulu 8.50.0.1017-CA-macos-aarch64) (build 25.275-b01, mixed mode)

the appcds script distributed does not create the appcds cache. That said, the new Apple M1 processors and the above JDK start zprint in a bit over 1 second anyway, so this isn't a terrible problem.

[VladimirKempik]

appcds is a feature of jdk11+, jdk8 only has CDS, which is a slightly different thing