Make jnimarshalmethod-gen not depend on creating JVM #714
Description
We use the JniEnvironment.Runtime.MarshalMemberBuilder in jnimarshalmethod-gen and that means we need to create JVM first. That is currently broken on Windows and hopefully not neccessary.
It would make the jnimarshalmethod-gen initialization faster and simplify things. We could remove the --jvm option as well.