Better options for Java 9 compatibility in project.clj

[WilliamParker]

In #409 we added a profile with arguments necessary to run under Java 9. This profile will only be used during development by those running a Java 9 JVM. I suspect that it is possible to autodetect this in the project setup and adjust accordingly. Alternatively other Clojure(Script) projects may have landed on other standard approach(es) that we might consider.

[eraserhd]

@WilliamParker It turns out that the module added for development on JDK9 was removed in JDK11, and that it was replaced with a set of normal Maven artifacts. If these artifacts also work on JDK9, then autodetecting is moot, as we can just make the java.xml.bind stuff dev dependencies.

/me goes off to make a patch