Fix for JDK-8159487 needs adjustment.

The “java.version” property from the jlink runtime is used to put in the `release` file which isn't what we want. It needs to come from the java.base module for the target image.

In addition, make/Images.gmk should be updated to take out the fields that jlink will now include in the `release`. Previously they are supplied by the build and not included in any custom images.