devel/ocaml-camljava: Update to 0.5, improve port

• Set MAKE_ARGS to -e, and add to MAKE_ENV the upstream Makefile variables which need to be configured, instead of REINPLACE_CMD them in post-patch.

• Set the rpath in function of the JAVA_PORT_VERSION, to restore support for JDK8.

• Drop patch to jnistubs.c, as it is essentially included upstream now.

PR: 282214