Review Request: 8005856: build-infra: Remove special handling of base module classes header generation

[Erik Joelsson]

Five classes which in jigsaw will be located in the base module 
currently have their native headers generated in a special way 
(explicitly with javah). This was because the base module could not be 
made dependent on the compiler module where the annotation 
javax.tools.annotation.GenerateNativeHeader is. Now there is a new 
annotation on fields, java.lang.annotation.Native, that can be used for 
these classes.

Since this change touches java files, I'm adding core-libs to the review.

Original change in build-infra was made by Fredrik Ohrstrom.

http://cr.openjdk.java.net/~erikj/8005856/webrev.jdk.01/

/Erik